I had a friend like that, he made insane amount of money from trading, zero emotions at all when dealing with millions of dollars that can be gone in a second, apparently that helps.
Trading is not easy and a bigger capital you are using for trading, a more pressure you have as well as bigger effects from emotion you have to cope with. It's not easy to repeat success from trading with small capital to trading with like x10 or x100 to x1000 that small capital.
When you are trading with very big capital, you don't chase for x2, x10 or x100 from it, you only need small percent of profit which is enough. You will prioritize safety and only open positions if you see good chance to get profit but it still has pressure. Big capital, big risk to lose big when you fail.
When gambling though, if you have no emotions then there is no need to gamble, because it's all about getting emotions back.
Gambling for fun is different than gambling for rich and do it irresponsible.