I only know about few people who have stopped playing gambling after making a big money and never come back to that field, but I think that such people are very few in this field while the rest of the people even after making a lot of people they never try to quit but want to make and more money from gambling, but it is not so easy from gambling and you can even lose everything you have in your hand.
It actually makes sense if you win some big tournament and lot of money and then use the earnings for starting a business with certain income stream. I purchased a smm store with the money I got from earnings in a card site tournament and the online store still brings me some profit every month.