What, they think to themselves, "Hey, everything about Sheen is repulsive, the news consistently reports people booing him off the stage -- I can't wait to pay for a ticket to see it myself!"
If it were possible, some people would pay to see a train wreck just so they could say they were there.
And some people have too much money (or credit cards) for their own good.
It’s the Pet rock theory of marketing: The public will buy absolutely anything if you promote it enough and through a different point of view. “No, it’s not a rock, it’s a pet” It’s PT Barnum. “No, it’ not a crackhead, it’s this really cool TV guy”...Then they go see it, and WOW..Guess what? We just paid $100 bucks to see a crackhead!
http://en.wikipedia.org/wiki/Pet_Rock