I am beginning to think that the only time a gambler gambles for fun is only when he gambles with what he can afford to lose. In this case, a gambler has $10,000 as his savings, and he gambles with $1000 down, he or she won't feel sad when they lose it (it means they gambled for fun). But if a gambler who has the same $10,000 gambles for above $5,000, and he loses all of them, the gambler won't be happy about his actions, and it might result in chasing of losses (which means he didn't gamble for fun). It means that both those that say they aren't gambling for fun sometimes gamble for fun, mostly when they risk an amount they can afford to lose. The actual time you gamble for fun is when you risk what you can afford to lose and not when you say you want to gamble for fun. However, a gambler might say he will gamble for fun and still end up not gambling for fun when he starts gambling. One can know a responsible gambler if he starts gambling.
Kind of right though, and in other words, we can say that gambling for fun is not about saying or prophesing it, but actually based on our actions and inactions; very much understandable and I quite agree with you.
But all the say, today, there are many or several gamblers who are risking way more than they can afford to lose, and still tell themselves that they are gambling for fun, whereas deep inside of them, they really can't do without a win, as a cover to their loses, this is something I personally think that majority of gamblers are acuallt guilty of in one way or another.
But again, it's also important we all know that not gambling for fun is not a crime, but then, when chasing those wins, we shouldn't risk amount of money that can greatly affect us and those around us negatively if lost.