People are just greedy, greedy for money and they are all looking for a way to get rich quick. Some people believe gambling is the way to go, just because they won 1 time big they will keep trying to win again and again. Gambling biggest problem is that it is addictive. You cant control yourself from it once you start it. I am writing the Book on Gambling Habbits. Hopefully it will be in market next month. 
But it depends of the game and i think only lottery can give huge amount of money and to be rich quick.. but if you are just playing to other games you can only make few profit if you have only small amount of capital.. but they are losing it and your right because of greediness..