From what I have experienced in any casino including casinopunk which I played some time ago. betting at $0.2 either when getting a free spin bonus or buying it never gets a profit above $10. Either I'm unlucky or the provider I play is not that good. Usually the PragmaticPlay provider is my favorite but in the future maybe I need to move around a bit to try whether $0.2 from buy spin exceeds $ 10 or not.
Оnline casinos don't program games and cannot influence the size of winnings, this is done by the provider from which they buy games. Each game has a different RTP and it is quite high, but the casino only gets a small part of the bets as profit. But the essence of the game is that the winnings are not distributed evenly, and luck matters here, someone may get nothing, and another player can get thousands of dollars. But do not forget that gambling should be for you as entertainment, especially those in which everything is decided by luck.