Dave's brother, Richard, has also written a book, called A Brother's Story, that you might enjoy.
There's also Kevin Lewis' The Kid.
Andy, I know what you mean. The trade jargon for them is 'misery' and I tend not to subscribe to these titles any more. You're right, there is a huge market in the genre and I'm not sure it's all for the right reasons. I know that authors generally see very little of the retail price of their books, most of it going to the middle men. One person salvaging some success from a hitherto miserable life is one thing, but publishers and sellers making ten times as much from someone else's misery doesn't sit too happily with me.
Grandmaof4, I have no problem with you reading these titles at all, don't think that for a minute, but I know you'd make me happier if you borrowed them from a library. A) I work for libraries, and B) whilst libraries pay for lending rights on the books, of which the writers get (again) a small percentage, at least it means no-one's having to produce yet another copy. That's better for the environment too. :-)