The casino is very correct and this has been my opinion for so long. It should only be called fun when no money is involved. If you are playing to earn money, it is no longer a fun. You are chasing profits. And in the other hand, if you eventually lose, you will also not be happy, where then is the place of fun?
It can only be fun, when you play with your spare money. While realistically, there is no spare money. So, there is no fun in losing money. If you actually want to have fun, then use the demo version.
There is no scope for fun in gambling if you lose. As long as a gambler spends a small amount of money, which does not cause him much financial loss even if he loses, gambling can be considered fun, but whenever the amount of money is large or money that cannot be lost but have to spent, gambling is not fun but frustration. I agree with you that when gambling for income, gambling is not considered fun, but after placing a bet there, anxiety increases. According to the conditions of the bet, the gambler has to be under human pressure. If the gambler is in a positive mood in the bet, then there is no pressure, but when the possibility of loss arises, the gambler is under pressure, at that moment not joy but disaster awaits.