It depends on what you earn per copy. At a $3 royalty per book you would need about 333,334 copies, and at $5 about 200,000 copies. That is why many authors pair a book with services: a higher-priced offer reaches the same income with far fewer customers. Check your own royalty statements for your real figure.
Divide $100,000 by your earnings per copy. At a $3 royalty that is about 33,334 copies, and at $5 it is 20,000 copies. Compare that with a service: at a $2,000 offer, 50 clients reach the same total. Your actual royalty depends on price, format, and retailer.
For most self-published authors, 5,000 copies is a strong result, though what counts as good depends on genre, price, and goals. If each copy earned $3, that is about $15,000 in royalties. If even a small share of those readers became clients, the book’s total value could be much higher.
Amazon. Ulatus reports that 80% of ebook sales still run through Amazon. That makes your Amazon listing, reviews, and categories important, but it also means you do not own the customer relationship there. An email list and your own offer give you a direct line to your readers.
The terms overlap. Self-published usually describes how the book was produced: you published it yourself. Indie author often describes a mindset: running your writing as an independent business with your own brand, products, and audience. Book Profits Club serves both, with a focus on building income beyond the book.
The market is large but uneven. Ulatus cites a global book market of $142.72B in 2025 and reports that print sales dipped 0.9% in the first nine months of 2025. Citing Publishers Weekly, it adds that adult fiction fell 1.3% while romance rose 7% and science fiction rose 12.3%.
Yes, when it is built to. A book shows readers how you think and lets them experience your method before paying. Adding a clear next step, such as a free resource, a call, or a program, turns interested readers into prospects. Book Profits Club’s training focuses on that path.