we cant guarantee that we will always win in gambling ,however when we win we must consider to control our emotions and not get too greedy so we can make a profit out of gambling.
That's the hard for some people. They don't want to end the winning streak that their luck giving them that's why still will continue to play then become busted afterwards.
But also, there are people who stopped playing after making some quite decent winning even they are feeling lucky. This is really good decision. They don't cover by their luck.