Small bets winning big and big bets winning none, is the crux of the discussion here, which only stamps the unpredictability of gambling games. There are instances of both and hence one should keep a limit as to what they are gambling with. Keep it limited to games you understand and games that you feel confident about and keep the budget on a limit too.

You cannot win every game and you will more likely lose more than you win which is why you should limit everything.