It can be foolish at times, but if you know what you are doing and are not under the delusion that you can become rich from gambling, then it's a fun activity. Some reputable casinos offer interesting bonuses that give you more money to play with, therefore increasing your chances of winning something big. But you need to stick to reputable casinos and only gamble for fun. While there are some "professional" gamblers out there, these people have a huge bankroll and can afford to lose money.