I am one of those people, I wager a very small amount, and usually wager for a big win, but depends on the game. I mean if it is a game like dice then yeah I do gamble to win big because what I am going to win or not is determined beforehand. But, if I am wagering something like slots, or roulette then what I am going to get is not really known, because in roulette I wager on both color, and number, which means that I could get anything there. And in slot you get to "win" many different results, even lose but not all.
So, it's never really known in those, but I always wager small, because I am one of those people who think it's not about money, it's about having fun, and that means even if I bet small amount, I should be fine.
While that it is not a bad mindset, you also need to have some bankroll management. It is important to have fun when gambling, but even with a small wager per bet, it can deplete your bankroll very quickly.