A traditional publisher provides an advance payment against future royalties, editorial input, cover design, interior production, distribution to bookshops through their sales team, and marketing. In exchange, the publisher takes the majority of the royalties (authors receive 10 to 15% on print, 25% on eBooks) and retains the publishing rights for the contract term.
The critical point is that the publisher does not guarantee sales. Most traditionally published books do not earn back their advances. The marketing support varies enormously and first-time authors often receive very little of it.
Amazon KDP and IngramSpark together replace the distribution function of a traditional publisher. KDP distributes to all Amazon marketplaces globally. IngramSpark distributes to 40,000+ retailers, libraries and wholesalers worldwide — the same wholesale distribution network that traditional publishers use.
A full-service self-publishing company provides the editorial and production functions: editing, cover design, interior formatting and platform setup. The author pays a flat production fee rather than surrendering a royalty percentage permanently. Everything the traditional publisher provides can be purchased as a service. Everything the traditional publisher retains — rights, royalties, creative control — stays with the author.
Self-publishing gives you more money per sale, faster publication, complete creative control and permanent rights ownership. It gives you less: no advance payment upfront, no publisher sales team pitching your book to bookshop buyers, no publisher prestige on the copyright page. For authors whose primary goal is reaching readers and generating royalties, self-publishing is the better economic model. For authors whose primary goal is a specific form of industry recognition, traditional publishing may be worth the trade-offs.