answer:I have a friend who did it for 10 years. He credited his narcissistic personality disorder. No kidding. At parties, he would assume that everybody was waiting to hear the next funny thing he had to say, and it took him a while to learn that this was boorish behavior. He left because the job required rubbing shoulders with similarly self absorbed personalities, because of the drinking, and because comedy can mostly only be done in a comedy club, while music can be performed in a variety of venues. I think comics that stay with it are mostly compelled.