An intriguing coincidence: The repayment rate of individual loans in Kiva (a broker for individual loans around the world) is 98.50%, which is quite similar to the payback percentage of Las Vegas slot machines.

However, Kiva helps allow you to act as a banker to people throughout the developing world (and more recently, the United States as well). And gambling can be an addictive and destructive behavior. So if you want to have a good time with your money, why not loan it to someone in need instead of pulling a lever and throwing it away?