You cant really just that make yourself expecting something positive because gambling is really just that random and also it will really be basing up with luck factor which this is something
that needed up for you to win.
It is a fact, with the game one should never expect something with too much Expectation, because in most cases we can lose, so that is where that logic comes from that we should never forget, first limit the money, second if we already have our money willing to lose then all we should do is bet and enjoy, and whatever the result is, enjoy it and accept it, nothing more, it is a Harmless logic.
Here is a mind game and if you misunderstand and hope for something that is not real, don't be disappointed or angry. There will definitely be a lot of losses and once you are lucky it is also very enjoyable no matter how much. What needs to be underlined is how gambling can entertain us without having to cause continuous regret.
Maybe for many people there will always be problems when they lose but that is part of gambling and over time with this activity most people should also be aware of the risks. Your suggestion to limit things in gambling has been applied by many people but sometimes there are still those who are fierce to the point of forgetting which makes their condition dangerous and uncontrollable.