When you put profit as your priority whenever you want to gamble, that's when you will not let go of your losses because you have the false hope that you can win the next game. If your intention is to just have fun by gambling on few games, you will be surprised that you will be lucky, but if you put all your hope on doubling your money when you start your gambling session, you will be disappointed at the end of the day.
The simple fact is that outcome in gambling is unpredictable, you can gamble for fun and still lose money if luck is not on your side, but the goodnews here is that you already will easily bear the loss since your intension with gambling in the first place was just to have fun, so it makes no sense crying over lost money except if the gambler was deceiving him or her self all along.
So, whether we like it or not, loses are real in gambling and can happen to any one, doesn't matter whether you are playing for fun or not, no group gets luckier than the other, else, most of us who gamble for fun would have become millionaires by now.