Yes you are mate, we must gamble for fun only and not have the mindset that we can earn daily a big amount of money because in the world of gambling we can not predict the outcome of our every bet. Sometimes we will win and sometimes we will loss. So it's better to aim happiness than profit. Here in in my country some gambler loss big amount of money because they are aiming profit. Once they put a bet they will mind that they will win and if they loss then they will double or triple their bet.
Those who gamble daily are addicts and don't gamble for fun. You will find them more than those you are talking about. Gambling is entertainment but when it becomes addiction the gambler himself won't be able to recognise this issue. Everyone starts for fun, adrenaline rush, excitement and passing time then when they start losing they become agitated and want to get the money that they lost. This is where the problem starts. If anyone is able to cope with that problem then they become social gamblers. That is what everyone needs to do.
Sure deal, when they already expressing the symptoms of aggressively trying to recover those money that they lost during their session, that action serves as the beginning of addiction, they are no longer capable to control and it will continue to the point that they will risk all their savings and if worse happened to them, they will lose everything and they will only regret when they already got an empty savings account.
Entertainment as it can be, but if the gambler already loses control, addiction will follow.