[fractallyte]

This could be a lot better (potentially ground-breaking) if you allowed more fine-grained control over the book content.

Allow the user to provide an arbitrarily-detailed outline, chapter by chapter, with characters, situations, dialog, emotions,... - everything that could be an ingredient in a book "recipe".

And I wouldn't package it into a completed book just yet - instead, provide a formatted manuscript (which you already do) which is open for revisions and rewrites, before inserting it back into the pipeline for final packaging.

What you have here is a high-level concept with premature pricing options. I would withdraw it, and keep developing it into something which offers unprecedented assistance in novel writing.

Oh, and at the very least, provide an example of the finished product, so users know what they're paying for!