Long Bets
Now here is something interesting. People come and make predictions for about $50 on social or scientific issues. Then others come along and place bets on whether or not the prediction comes true or not. Depending on how the prediction falls, the loser gives a specific amount to charity, while those on the winning side claim credit for defending the proposition and the individual making the prediction gets the prestige of making the right call.
Interesting concept. Not that I would participate right off the bat, but if it ever took off I might.