People may continue to play gambling games despite frequent losses due to various factors, including the thrill of risk, the hope of a big win, social aspects, or even issues related to gambling addiction. The reasons can be complex and may involve psychological, social, or personal factors that contribute to continued participation despite unfavourable outcomes.
They didn't want to track the amount they've gambled away and the profit they've earn, that's why they always gamble and avoid the basic principle of profit (income > expense). Even they're able to make money from gambling, they will use the money for other entertainment instead of investing and try other way to make money. So they're built to become a gambling addict in the first place, either they're win or lose, the result is same.