We do a lot of things based on emotions. Controlling emotions can also be considered a bit of luck. Because when we become addicted to gambling, no matter how much money we have, if we repeatedly face losses, we lose all our assets next to emotions. And especially this is not only in terms of gambling but also when we go shopping with our family or go somewhere to travel.
The human mind and money can't be disconnected, you see the reason why you see people becomes emotional is because of money they uses in gambling, if you use huge amount of money to gamble and you lose, you are going to feel it because you never gamble with the intention of losing, if you were going to lose you wouldn't use huge amount.
This is why everyone that has potential in gambling profit should use small amount of money, an amount they can overlook and not feel anything. If you don't, you will be tempted to expect money in return and when you lose, emotions will definitely comes back to you.