Most old-time gamblers are good at controlling and faking their emotion I don't think it will be an issue at all it's the newbies that will have a hard time proving if they can take a loss, because while you are learning how to gamble you'll also become good at concealing your real emotion
so it will be no problem for old gamblers.
If faking an emotion is essential and will good for the gambler, he has to do it so that he can't take further losses.
But most experienced gamblers have that ability because they know how to take the situation correctly and lightly. As with the newbies, they can't take losses and it's hard for them to accept their losses which triggers them to get into more losses.