You can gamble your life, it's dangerous, but in can be a career. However, skill based games such as poker are probably the only career in gambling which can be sustainable what comes to money, and only for a few. I've gambled in casinos, know some heavy betters and friend have bought a few nice cars with money he made betting on ice hockey. However, I've also done some stuff for big online casino brands, and have seen stats... you can be lucky, but in long term casino wins always