People who don't find him funny, ironically, are part of the reason so many do, because someone who doesn't believe what he's saying, can offend them enough to complain or be outraged and indignant. They're the people who are the butt of his jokes. The other reason people like him is because he's so fucking quick. Most comedians might spend a year or even two perfecting the same stand-up routine, which will be funny, and then film it. Frankie Boyle can do it off the cuff so he can post them every minute on Twitter or put down a heckler with absurd ease. I think Frankie Boyle is just about the only stand-up at the moment who could survive Whose Line is it Anyway. Possibly Jimmy Carr as well.