I am firmly convinced that the ability for anyone to create, using AI, its own campaign book and distribute it for free (for the benefit of those who can't be bothered to ask an LLM to do so) will eventually lead the price to zero (or near zero, for those who'll want to support an innovative prompt), ending the problem of people profiting from it. There are people who sell AI books right now (and more power to them, because it's not forbidden) but I think it's a temporary thing, because their customers don't realize they can run an AI at home and get the same thing.
One could explain that the AI-book seller is selling his technical know-how for using AI at a currently higher price because the tech is quite new, much like one could certainly make a living by typing text in the past and stopped being able to sell this service as soon as every executive out there knew to type their memos themselves. The new generation (who is currently trying to pass AI work for their homework) will certainly scoff at buyers of AI novels.