BEEN SICK! 1st post delayed.

Right, posting. I started reading a Better Angel, by Chris Ardian and so far... It's depressing. The very first story that I read, right out of the box, dealt with a disembodied suicide victim in a coma... that's the FIRST STORY. I'm already anticipating much pain from this book. Why do all best sellers seem to be depressing. Can some one tell me that? I'd really like to know.