Self-control. That is one of characteristics of professional and well known gamblers. That's actually how they gone so high. Of course there are another factors of success too, such as skills and luck. But I count self-control as the main of them. Not each of us can stay cool headed during the game and that's one of reasons why we loose at the most of times.
Yeah. It takes a lot to stand up and say i'm done when you're either at a loss or on a winning streak. It goes with discipline. And most people don't really take it into heart because gambling draws them in and lures them into spending more time. The longer you stay in a gbling table, the bigger your chances of losing money gets.