Gambling is very fun activity especially with using money. However, if gambling is done continuously in my opinion it will be a bad habit. Simply done sometimes and not needed.
Actually It is in people nature to take the risk on every step in their life. Gambling is presenting that risk that can be taken if decided by each individual separately. This risk represents entertainment for some and way of unsecured earning for others. Gambling is metaphorically speaking our escape from the reality that is filled with real problems we tend to forget about while putting bets on the games.