Gamble on the games which is beneficial or lucky for you and helps you to make some money and lose the money.
There's no way we can conclude that we are lucky without trying and even if we try it, there is no way also that we will be lucky all the time.
The only way that gambling will become beneficial to us is if we enjoy it, other than that, I don't know because the reality will tell that we are losers in the long run.