Audiobooks
I just got through listening to Michael Lewis' The Big Short about the subprime mortgage meltdown. I found the audiobook to be both informative and entertaining, especially the reactions of the main characters as they more and more fully realized how totally fraudulent was the market built upon the subprime mortgages.
Regarding books read by the authors, I've enjoyed Gary Chapman's The Five Love Languages and Malcolm Gladwell's The Tipping Point, although these were both nonfiction. You may well be right about fiction folks reading their own stuff, although I imagine that Steven King would kill one of his own books.
Devotional/Religious material seems to be a poor fit for audiobooks. You can't track down any of the cross references which might be mentioned in the text, nor can you really reflect/meditate/pray very well in traffic.
I'm fairly new to audiobooks, but I'm digging them so far. They seem to help me stay calm in traffic, since I can't be bothered to "get into it" with other drivers -- I might miss this next part of the story!