Yes, with repeated attempts we might win someday but the point is that we shouldn't stress ourselves over winning a lottery.
Doing that, we would just decrease our mental well-being and lose money which will just increase the impact.
This is why maintaining a balance is strictly necessary while gambling.
One of the major common problems with gamblers is being to expectant, gambling is a 50/50 game, a game of risk and chance, there's every chances of losing and so are there chances of winning, but they must also remember that the chances of losing are way more higher than that of winning so being too expectant of a win all the time might just mess up one's mental composure just as you've earlier stated.
Again, too much expectations brings disappointment, but when you just play and expect nothing but the fun and the thrill of the game, rather than the outcome of the bet.