They might say that they are like that but in the end, they really want to earn money and that's just how people are. Everyone wants to win, and it's just that there are people that like just to enjoy it and take losing like a champ. If you bet what you can afford to lose, you can just enjoy and not be affected to much.
Everyone love money , thats a fact and the second one is that when someone lose even a slight amount of what he had then it is going to stress him out. You lose your money and definitely you are not going to be cool about it, everyone wants to win some money even if it is only a small amount.
But I usually fix a small amount for each session of gambling to have a fun and even though I lose those coins I will not take stress because I know that it is not possible to win money from gambling. But if I win then I consider I'm lucky for that day. I consider these fun gambling like going to movies or for other fun activities. Remember we also need to spend some money for these fun activities and we never take a stress right?