Pretty much a common sense especially if you've been gambling for a really long time, not a lot of people have what it takes to be a professional gambler so it's best that if you get a win, you better quit while you're ahead, those feelings of luck is just an emotional outburst caused by the win and sometimes fall for this emotional trap and they let their wins ride another spin or game and then they end the day on a loss because they thought that that win was a signal that they're on a win streak when in reality it's just math. I love what @gunhell16 said, wins make gamblers more aggressive which is true and it happens in other kinds of games, you are winning or close to winning so you go for the aggressive approach to make sure no one can catch up to you but that's not applicable in gamble, being cool headed and knowing what to do next is the best thing you can do when gambling.