It's hard to really get that excited about movies. Think about it like this: how many good comedy movies come out a year? Maybe one or two? And then, in those movies, what are the chances that there's a character that I'm the best fit to play? It's really small!
You go to any Jay-Z concert, and he plays his hits. Comedians don't have hits. You have to have a whole brand-new hour. You have no hits to rely on. It's the hardest thing.