People who are playing gambling are betting on that game for them to able to win and I don't know the other reason they do that because they want to be rich or change their status in life to afford everything they want to buy and fulfill their needs.
Maybe become rich from gambling will be their reason for still playing gambling. And they still enjoy the process even if that can give them more losses. They will not think about the money, but they care about the outcome. If they cannot win, they will try over and over, and of course, they will use more money to try their luck. They hope that one day they can win the games so that they can give them the money, but if they can calculate the winning money versus the losing money, the lost money will be bigger than the winning money.