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.
Not all slot providers or games are created equal. And your betting strategy can make a big difference in how your returns pan out. But if you ask me, I think you maybe mistook being unlucky for a bad provider,
whichgetting maliciously bad odds is unlikely unless you were playing on some unknown platform. The games are heavily regulated so there is not much influence that casinos can have on games.