Yeah, people are enticed to play in the casino because of the chance of getting a huge win. So I think playing for fun is just an excuse to make them engage in gambling to try to get those huge win. I believe people who engage in gambling has this underlying intention to win money since in most cases, it is really the reason why people keep on gambling.
Because why not? Isn't it fun to win? The underlying problem is it is gambling, anything could go wrong, anytime you may win and mostly will lose. Once people is teased having a good win, people try to make win bigger and bigger, its the nature of a human of being greedy. Once someone can't control itself, probably will ask more until it become problematic.