If people do gambling excessively, it will be impossible for them to get pleasure. This applies also to other types of activities. Each person has their own way to enjoy life. And the fun that people out there offer, isn't free!
I dont how many of the addicted gamblers really gamble for pleasure. Rather they do it because they feel they have to earn back the money they lose. In fact if you see it this way - the gambler was in the hope of making big money and thus came to the casino. They lose some money but they were making some back and they still continue to do so. Then the red streaks start wiping out his balance and they cannot recover.
I dont find how this becomes pleasureable. It becomes a source of pain and suffering at one time if they dont control themselves.