Gambling can be only profitable if you are lucky and the chance is really low that you can make some profit with gambling because the chance is just to be lucky to win some money.
And the chance is really low that it can be profitable for you because losing is a higher chance.
yup, every game is design in such a way that you will tends to lose. and people tend to be greedy. so when you are winning, you will tend to play more, and the more you play, the probability will kick in and you will end up losing.