Writing is unpleasant enough when you are passionate about the story (at least if you are attempting good writing). Why write it all if he has so little interest?

The more cynical explanation I can come up with is that he just likes the fame and the money, and that's the only reason why he's still writing. The other, less cynical theory I have is that he actually does care, but doesn't have the talent to get it to show on the page.

Mind you, when I was depressed and no longer able to enjoy writing, the fact that my heart really wasn't in it absolutely showed. It resulted in lifeless prose, the rushed pacing you get when the author just wants to get it over with, careless mistakes and a general lack of effort across the board. I just didn't care enough to try harder. Of course, the important difference here is that nobody wanted to publish the results. Because I actually have to produce quality to get anywhere, unlike some people I could mention.