I just don't know if it's true what other gamblers say that with a small amount of bet you can win a big amount, the usually minimum bet is around 0.2$, with this bet amount the luckiest
I've hit here seems to be around 160$ but the one I know who is around 0.5$ to 2$ tells me that when he gets lucky, he wins 800$ to 1000$.
The true purpose of bankroll management is to keep your gambling within sustainable limits - it has nothing to do with luck. Even small bets can win big when you're lucky, but without the discipline to manage your bankroll properly, you risk losing all your winnings and ending up with nothing.