The big questions here can you make a living here even if you are playing for years and have allocated a lot of effort and time studying it, I don't think so it's still a game of luck, the only hard work that you can get from gambling is how to control yourself and how to address yourself when you have to stop playing when it's about time to stop.
I disagree with your assumption that hard work can control emotions when trading. Even hard work in trading is wrong, actually not entirely wrong, but not too much portion. In trade, I always prioritize smart work, smart work where we are able to find efficient strategies, consistency in performance, and money management. It's different from when we give more portions to hard work, where we will continue to pursue profits, trade with challenges, be inconsistent.
Hard work is important, but smart work is more important. Hard work can provide encouragement when trading while smart work can provide peace in trading so you trade in relaxed conditions.