Don't gamble, just invest. that's all.
you can only lose with gambling
Even thou that statment may usually be right, that is not correct if you gamble on EV+ situations, when the expected value is better than 100% return on avg, and such games you find all the time in Dragon's Tale for example.
There's also professional gamblers in lots of fields like poker, horse racing, sports betting and so on that live on there profit from gambling so even if gambling for the masses is an ev- thing on avg, everyone has the chance to win in the short perspective and there is also those that win and profit good on it in the long run.
So if you only(or most of the time) bet on situations your expected to win in the long run on, your almost garanteed to profit on your gambling.....