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Gambling is actually only fun and exciting when it comes to real money. Only then do you feel the adrenaline and tension in your body. With the end that you hopefully win. You can also play with lower amounts, which you can easily lose, but I personally think that the tension is not there at all and then you can not really enjoy a certain amount of fun. It is difficult to say from what amount you can really enjoy it. There are people who play games without money, but that is not gambling of course.
I think it's a matter of preferrence. Some people enjoy also on playing even though they're playing on Demo/free mode. For me, it's much much fun when money is involved and when I am winning, ofcourse, profits, or rather say, easy profits really make me happy. On the otherhand, on the losing process, its very opposite of being happy. It's frustrating but it is part of the game.