Casino is a good opportunity to try your luck. I am not sure that it is possible to constanly earn money at casinos but some people are lucky and they earn money.
Be careful not to gamble with what you can afford to lose because gambling can ruin your life, but for sure many players have been lucky to have hit it big on some games that turn their life around.
I saw that Drake won a lot of money from betting on the world cup, so gambling can be highly interesting when the system, is favoring the player but it can be disastrous if you lack the basic discipline to control the wager limits