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.
@LUCKMCFLY, I believe that those gamblers that actually have a winning amount in mind before gambling are people that are not yet very experienced in gambling because if they are, then they will understand that it's very possible that they can even lose every money they had in gambling and yet may not archive the winning they expected. It's possible they could also get some winning but because the amount is not yet up to their expectations, they will keep gambling Just to multiply the winning, as they keep gambling, they may still end up to lose the previous winning.