Yes, people play gambling to get some money and not for fun only.Those who have ample money can use if for fun only. And now to OP question of Gambling being good or bad, it is not allowed and forbidden in few religions also. and for the other people it is just an activity and they really dont care it is good or bad.
That's the current mindset of people who gamble now, except the professional gamblers around. We think that we could gamble and get away with it most of the time because we can and have experienced it, but we didn't know that in the long run, there would be a possibility, a continuous chance that you are probably going to lose, even when it's not in the long run.
Professional gamblers are also experiencing a lot of defeats, and they also think the same about badness in gambling, but there's always a turning point for it where he realizes two very important things are analysis and management loss percentage, after which they never complain gambling is wrong.
If it's associated with faith and religion, you should reassure yourself of the positive law. Religion does prohibit this but on the one hand there is no deeper study of the professional attitude of gambling, they only generalize all the gamblers. The point is that if the bad gambler percentage is 70%, why do not we choose side to be 30% ?