A bot with a good reputation adds a listing at 1.27x the price of a worse-reputation listing. Another bot had a conflicting strategy: selling at 0.99x the price of the next cheapest.
Not talking about the physical book, that's old news. LLMs drive the price and time requirements of "writing" the book down below what one consumer would require. So you could theoretically generate a listing, wait until someone hits it, and then ask the LLM to write a book that hopefully vaguely resembles what you promised.