An empire historian, a medical astrologer, and a Catholic theologian crossed 100 paid subscribers
Three small Substacks — a historian of American empire, a practising medical astrologer, and a Catholic theologian — each crossed 100 paid subscribers in the past 30 days; this issue breaks down what they charge, the paywall cut each chose, and the move that took them over the line.
The October 2 screen produced three fully verified cases. Each is written by one person about a subject that person has spent years inside, each took its first Substack Bestseller badge between September 2 and October 2, 2026, and each keeps its total audience under the 5,000-subscriber ceiling.
Imperialist Realism, the foreign-policy historian Daniel Bessner's argument that American empire is a state of mind, published its first post on August 3 and took the badge within nine weeks. Medical Astrology + Lifestyle Alchemy with Sidney, the practising astrologer Sidney Brassfield's method for reading the body through the birth chart, sells protocols that run up to 11,000 words. Recovering Catholic, Sarah Carter's writing on the Church, put a three-part argument about birth control behind its paywall and left the live discussions free.
The three charge $6, $9 and $5.99 a month. Each puts a different thing behind the wall: a working historian's reading of power, a systematised craft taught in full, and a trained theologian thinking out loud at length.
How this screen works
Substack awards its white Bestseller badge at a hundred paid subscribers, counting active plans and excluding free trials, gifts and group passes. 1 A badge proves the hundred-paid floor; the rounded subscriber line on a publication's own subscription page proves the ceiling. Substack publishes a New Bestsellers list of every publication that took its first badge in the previous thirty days, and this screen sweeps that list against three gates: a solo author rather than a company, a total audience under 5,000, and a first badge inside the window. 2
Case 1 — Imperialist Realism
Positioning and audience
Imperialist Realism argues that American empire is a political formation and a state of mind at once: it shows up in war budgets, in recruitment commercials, and in grunge bands. 3 The publication reports 2.5K+ subscribers and charges $6 a month, $60 a year, or $150 for a founding subscription. 4 Its first post, "Empire of Grunge", went up on August 3, 2026, and twenty-four posts have followed in the nine weeks since; the badge puts paid readers at a hundred or more. 5
Authority and unfair advantage
Daniel Bessner is the Pyle Associate Professor in American Foreign Policy at the University of Washington's Jackson School of International Studies and a non-resident fellow at the Quincy Institute for Responsible Statecraft, and he advised Bernie Sanders's 2020 presidential campaign on foreign policy. He has published two books, including Imperialist Realism: Politics and Culture at the End of the American Century, and co-hosts the Signal Award-winning podcast American Prestige. 3 A reader can check every argument against a decade of scholarship, and the newsletter carries the same claims to a faster deadline. The critic Mark Sussman edits it. 3
Cadence and post length
The About page promises two or three posts a week with at least one paid-only, and the archive keeps that pace. 3 Essays run about 1,500 to 4,100 words; the interview episodes of the Mutual Ruin series run 100 to 170. 678
The free-to-paid cut
The free posts make the cultural case — Falling Down, Macklemore, the buried Coyote vs. Acme film. 910 The paid tier carries the arguments that land closer to the reader's own politics and the recorded conversations: "Nine Theses on Cancellation", "The Left's Walter White Problem", and the Mutual Ruin interviews with other writers. 678 The free pieces are whole essays rather than teasers, so they teach the method on material a general reader will click.
The conversion lever
The publication began charging on day one instead of building a free list first. Bessner arrived with an audience already assembled from the American Prestige podcast and years of bylined journalism, which is the explanation the pages support; no single post is documented as the trigger, so the dated sequence stands and the attribution stops there. 35
Who could reproduce the model
Anyone whose authority rests in a body of work an editor can check: a university researcher with a public-facing specialty, a think-tank analyst, or a trade journalist who has covered one industry for a decade. The model needs an existing audience and an argument too long for a magazine.
Case 2 — Medical Astrology + Lifestyle Alchemy with Sidney
Positioning and audience
Sidney Brassfield reads health through the birth chart: which planet governs a reader's inflammation, which house governs digestion, how to time a healing protocol to a transit. 11 The publication reports 2K+ subscribers and charges $9 a month, $99 a year, or $222 for a founding subscription. 12 The badge puts paid readers at a hundred or more.
Authority and unfair advantage
Brassfield sells one-to-one "Medical Astrology Health Blueprint" readings and has built the newsletter on the same method she practises in them. 11 Her edge is volume and system rather than access. She publishes 5,000- to 11,000-word reference guides on single placements — Ceres, the 8th house, the nodes — that a casual astrology account will not sit down and write. 1314
Cadence and post length
Three or four posts a week. Free explainers run 1,300 to 7,000 words; paid deep dives run 4,500 to 11,000. 131415 Here the length is the product; the reader is paying for a reference shelf.
The free-to-paid cut
Free posts take one idea or one complaint and do it properly: "The Astrology of Skin Issues", "Medical Astrology Without Functional Medicine Knowledge Is Just Vibes". 1617 The paid tier holds the complete guides and the seasonal health horoscopes. 1318 The free tier demonstrates she knows the system; the paid tier hands the system over.
The conversion lever
The newest move is "Gut Codes", a digestion blueprint published free on September 29 as a way in for a new reader. 19 It followed a three-part Cycle Alchemy series that ran through August and September. 20 She has published no account of which piece converted whom.
Who could reproduce the model
A practitioner of any systematised craft whose knowledge is deep and badly written down: a medical astrologer, a herbalist, a strength coach with a method, a tarot reader working from a defined system. The requirements are a method you can teach in long form and the patience to publish it free, one piece at a time.
Case 3 — Recovering Catholic
Positioning and audience
Sarah Carter writes about modern Catholicism from inside it — prayer, morality, politics — through ressourcement theology, the mid-century movement that returns to Scripture and the Church fathers rather than to the week's press release. 21 The publication reports 2.5K+ subscribers and charges $5.99 a month or $53 a year. 22 The badge puts paid readers at a hundred or more.
Authority and unfair advantage
Carter studied economics and Catholic studies at the University of St. Thomas and took a master's degree in theology at the St. Paul Seminary School of Divinity, where she researched Pope Francis's Laudato si' and its implications for spiritual practice; she has worked in campus ministry and now works in politics. 21 She also runs a second publication, Pope Leo Weekly, a Monday read on Pope Leo XIV that has passed 9,000 subscribers. 23 Her advantage is a trained theologian writing for people who are not theologians.
Cadence and post length
Unsteady by design. Carter wrote on her About page that an unexpected and difficult pregnancy meant "slower seasons", and the archive shows two to four posts in most months. 21 Essays run 900 to 2,700 words, alongside podcasts and recorded interviews. 2425
The free-to-paid cut
The live discussions stay free, including "Voting as a Mature Catholic", a webinar she hosted on September 27, and an interview with Helen Roy. 2627 The written arguments are paid: a three-part series, "Breaking the birth control gridlock", ran from August 13 to September 30. 242528 The free events put her in a room with readers; the paid essays are where an argument that needs more than an hour gets made.
The conversion lever
The birth-control series is the dated spine of the window: three essays, six weeks apart, each resuming where the last stopped. 2425 Carter's About page still says she does not paywall her writing, and the current archive contradicts that — the paywall is live on the series. 21 No post names the cause, so the sequence stands as the evidence.
Who could reproduce the model
Someone with formal training in a tradition and a plain way of writing about it: a canon lawyer, a seminary teacher, a religion reporter, a hospice chaplain. The publication is a place to think out loud about a body of doctrine, and readers pay to watch the thinking happen at length.
Near-miss audit
Three other publications on the same list cleared the milestone and miss one gate each.
Pope Leo Weekly reports 9K+ subscribers, over the ceiling, and charges $6 a month or $67 a year. 23 Its size is the only reason it is not profiled here, and Sarah Carter, one of this week's three, writes it. Project Sabrina, the algorithmic stock-picking newsletter, is published by Project Sabrina Inc, and its picks are generated by a platform with "additional analysis from our human team" — a company, not a solo author. 29 RiffPost, a newsletter "for people 38 and over" by Nick Catucci, took the badge but publishes no subscriber count, so the ceiling cannot be checked either way. 30
Three adjacent niches to test
Sanctions and export-control compliance for one sector. Imperialist Realism shows that people will pay for a specialist's read of how state power actually works. The compliance version is unwritten: a trade lawyer tracking enforcement actions against one industry — semiconductors, aerospace, shipping — could keep a weekly enforcement roundup free and sell the playbook for auditing a customer list.
One traditional health system applied to a single condition. Sidney sells a method applied to the body one protocol at a time. The narrower version belongs to a practitioner who owns one diagnosis — endometriosis, long COVID, perimenopause, an autoimmune condition. Free posts could teach one principle a week; paid posts could carry the protocol, the case notes, and the questions to bring to a doctor.
Canon and governance for one religious institution. Recovering Catholic sells a trained theologian's weekly thinking. The administrative version belongs to a canon lawyer or a diocesan officer writing for the volunteers who keep parishes running: a free weekly Q&A on the rules that trip people up, and paid templates and policy documents a board can act on.
What this trio is worth at the milestone
The channel's benchmark holds. Five hundred paid subscribers at $10 a month is $5,000 a month, or $60,000 a year, before platform fees. This week's three show how small a list it takes to get there.
At $9 a month, Sidney's tier, 100 paid subscribers are about $10,800 a year and 500 are about $54,000. At $6 a month, Imperialist Realism's tier, 100 paid are about $7,200 and 500 are about $36,000. At $5.99 a month, Recovering Catholic's tier, 100 paid are about $7,200 and 500 are about $35,900. Each also sells an annual plan at roughly ten months' price. 41222
References
- 1What is a Substack Bestseller badge?
support.substack.com
- 2New Bestsellers on Substack
substack.com
- 3About Imperialist Realism
imperialistrealism.substack.com
- 4Imperialist Realism subscription page
imperialistrealism.substack.com
- 5Empire of Grunge
imperialistrealism.substack.com
- 6Nine Theses on Cancellation
imperialistrealism.substack.com
- 7The Left's Walter White Problem
imperialistrealism.substack.com
- 8Mutual Ruin: Imperialist Realism x Ben Burgis
imperialistrealism.substack.com
- 9Imperialist Realism at the Movies: Falling Down
imperialistrealism.substack.com
- 10Mackle More, Not Less
imperialistrealism.substack.com
- 11About Medical Astrology + Lifestyle Alchemy with Sidney
sidneybrassfield.substack.com
- 12Medical Astrology + Lifestyle Alchemy with Sidney subscription page
sidneybrassfield.substack.com
- 13Ceres in Medical Astrology
sidneybrassfield.substack.com
- 14The 8th House in Medical Astrology
sidneybrassfield.substack.com
- 15Let Me Read You to Filth Using Medical Astrology
sidneybrassfield.substack.com
- 16The Astrology of Skin Issues
sidneybrassfield.substack.com
- 17Medical Astrology Without Functional Medicine Knowledge Is Just Vibes
sidneybrassfield.substack.com
- 18Your Libra Szn Health Horoscope
sidneybrassfield.substack.com
- 19Introducing Gut Codes: Your Digestion Blueprint
sidneybrassfield.substack.com
- 20Cycle Alchemy: The Medical Astrology Guide to Your Luteal Phase
sidneybrassfield.substack.com
- 21About Recovering Catholic
recoveringcatholic.substack.com
- 22Recovering Catholic subscription page
recoveringcatholic.substack.com
- 23Pope Leo Weekly subscription page
popeleoweekly.substack.com
- 24Breaking the birth control gridlock, pt. 1
recoveringcatholic.substack.com
- 25Breaking the birth control gridlock, pt. 3
recoveringcatholic.substack.com
- 26Voting as a Mature Catholic
recoveringcatholic.substack.com
- 27Making Marriage Work for Women w/ Helen Roy
recoveringcatholic.substack.com
- 28Breaking the birth control grid lock, pt. 2
recoveringcatholic.substack.com
- 29About Project Sabrina
projectsabrina.com
- 30RiffPost subscription page
riffpost.substack.com
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