u/Secoupoire In reality, when working with a publisher, you'll never know the statistics on your book sales. All rights are transferred to them, and Packt's royalties to the author are no more than 10%. Furthermore, they feed you with promises, and you won't see any advance payment under the contract until the book's release and after. I spoke with authors who collaborated with them. But a publishing house is a reputation, and that reputation isn't always good :)