According to an article in the New York Times, the Web site Stickk offers a service where you give them money that they will donate to charity if you fail to go to the gym as often as you promise to....

According to an article in the New York Times, the Web site Stickk offers a service where you give them money that they will donate to charity if you fail to go to the gym as often as you promise to. (You can even have the money donated to an anti-charity—a cause you disapprove of.) Why would anyone use this service?