That's why it's so important to determine the amount of money you are going to gamble with. You set that aside and that becomes your budget regardless of your results. If you win something with it, great. You did better than many other players. If you lose all of it, you stop because you spent all of it. Under no circumstances do you add more money to that budget trying to recover or minimize your losses. That's when you end up performing even worse than expected.
This chosen figure is not only its value but also its percentage in your general finance and regular income. $100 can be small with you but all money another person has for example so if $1,000 is small with you, you can use it for gambling very feasibly and comfortably. With the other gamblers, if their finance is not good, they must spend a much smaller fund for gambling as $100, $200 or any gambling budget most affordable with them.
It's is not only an attemp to minimize your loss from gambling but also to avoid unnecessary dramatical effects on your finance and life quality.