That's the main purpose of gambling, it's meant for fun but a lot of people are trying to turn it into a source of income that's why they are constantly getting stressed out. The game wasn't designed for gamblers to make profit but people still do as a result of luck trying to make it a constant thing isn't really possible. Just like you said, expecting too much is just going to get you disappointed, always be ready to accept the outcomes.
Gambling is for fun but the same time is another means of making money because people play for both money and for fun because if it is for fun then you should not be making use of the money you won, this shows that all we want from gambling is not more than the money.
And when you gamble it is obvious because of the money there is nothing anybody can tell me. And you going into gamble they are suppose to be ready to accept what ever out come that gambling comes with so there are only two things that gambling comes with is either you win or you lose is either one of the two.