They really don't, and plenty of them end up forced to work on books they know are garbage because it's that or get fired by some bean-counter who couldn't possibly care less about all that artistic integrity nonsense.

That sucks. At least all the bad books allow us to appreciate good books more.

Also like the Nostalgia Critic said, it's hard to believe that something this phoned in can get approved. (He said that about the movie, but it also applied to the book.) However, I'm starting to see how it's apparently much easier than I thought.