If we play gambling everyday it has became a habit and like some of us know it is very difficult to break bad habit. I do strongly believe that many of those claims to be gambling for fun are seriously addicted to gambling and what makes it fun for them is coming back to play.
They claim that it is fun because they can do nothing to control their addiction but to give in to it. They know for a fact that they are wasting their time and money but that gambler fallacy still runs wild in their minds. These people are mostly the ones who dont have a steady income because that is what makes people try their luck and gamble their earnings. Those who have a settled lifestyle prefer to stay away from it.
But there are genuine people who gamble once a while in a friendly match and do it for fun - these people are not like the daily addicts though.