It's just because people are blind when they saw the profits and the fun in gambling and forget how dangerous gambling can be with them.
I agree, we can't blame them since we all do love money, and winning a jackpot in gambling is really provoking, especially if we are to desperate on winning such amount, that is why it doesn't matter how much money we are going to spend just to know if we have the luck to win in gambling. Sometimes, the amount of money that you have used in gambling is much bigger on the amount that you could have win on one time.