No I don't believe that most of people are gambling for fun. There are many way to make a person fun so don't take gambling as one of it. If most of the people are just gambling for fun, why still there are lots of butthearts when they experienced losing? Also if they are gambling for fun, why I still see some post about hoping they want to win big?
Don't believe for gambling for fun. They all like to get profit seriously. It's not that they afford to lose such any amount. They are just saying that they gamble for fun so that they don't mind the loss they had eventhough in their own mind the are regretting it.