It seems to me that its entirely possible to combine the fun of gambling with earning money. if you are a professional sports bettor you can enjoy both the thrill and the income it brings. As for slots you can also play them for money but it's important to approach this responsibly. Don't quit your main job right away! 
Jokes aside. it's true that we all love money but anything that clouds a clear mind is not a winning strategy.
We will always be people who will seek to earn more and whenever possible we will try to do so, sometimes greed is one of the things that can make us lose control and because of these things mistakes begin and those mistakes when we do not correct them because it makes us go in the only direction of addiction, so every time we are in a casino it is easy, if we have Losses then we Assume them, but if we win we have to withdraw the money, there is no other option, for that we have to be clear about what we are looking for, in We cannot fail that, and it is also better to always be Depositing and playing with a controlled balance than to be putting in much more money and that is Another mistake. So the fewer errors we have, the better for everything.
I agree with you on this.
A good example are People who always leave the casino with nothing, it's not that they dont actually win when they gamble, but greed will make them never to be okay with whatever they win, it'll never be enough for them to vover all tgeir losses so they continue to gamble with their winnings even when they were supposed to walk away, they'll gambling until they finally lose every damn thing.
The most important aspect of a gambler's life when gambling is his ability to know when to walk away whether in the midst of losses or winnings. It's very important to know when to cut your losses and just leave the casino before you end up losing everything.
Sometimes it is not easy, but I have learned a lot about this, when one loses in the casino one realizes that the best thing for us to do is that if we have some profit we have to withdraw, otherwise it is spent and that's it. Everything arrives, and it is much better to have the money ready so we can enjoy it or deposit it little by little. I bet little, I am not one to bet a lot of money, but when things are arranged with control they turn out well, I am not one to gamble in a crazy way, but I have learned to control when I have money for the casino, because I like to play At least twice a week, and that's something I enjoy, so I take those precautions, never without decapitalizing myself.