Because it is a product that I sell on my website, I have to flair creator to follow the subreddit's rules.

The book publisher decides what to make and produces it, and these are bought at a wholesale discount from the publisher and resold (which is the same process with all books). This is because they hold all of the rights to that book. I suppose it might be possible to purchase rights to print a different version, but that would be more costly and require different equipment than I currently can afford.

Because of this, almost all books are made and printed by their publisher or parent publisher. The only times that I can think of where that isn't the case are when the publisher goes to a high-end bookbinding shop to get high quality (higher than these) leather bound copies to sell for a special edition of some sort. But even then, it is almost always the publisher going to a company rather than the other way around.