I don't ask for autographs -- my thinking is, I've already gotten more from these people than I deserve, so why ask them to give me something else. I'm there to give them something -- my admiration. Everybody craves admiration.
But what you've got here is basically just a bunch of gritty, dirty, not particularly likeable people doing nasty, unpleasant stuff for causes it's hard to care much about. And you get a generous three hours worth of it, too.
Most books you want to remember. "Hungry Ghosts" you want to forget. But not because it's bad (quite the contrary) - but because it's too hard to believe.