This clip from a 60 Minutes profile of IAC CEO Barry Diller which ran last summer bears watching again. Especially the last 10 seconds, in which Diller's wife and close advisor, Diane von Furstenberg, explains Diller's business philosophy:

What drives him is the vision. It's definitely not the money. He has this vision, and he's not quite sure what it is, you know, and then he kind of fakes until he makes it.
Good thing Diller doesn't care about the money, because he only made $295 million last year.