For me, I feel like it's probably easier to quit when you're losing because of the hype around the winning, it's really difficult to quit when that's what is happening not to mention that it's easy to see yourself quitting when you know and are aware that you're bleeding money, it's much more logical for you to quit as soon as possible, that's how simple I think is the reason why it's easier to quit when you're on the losing streak rather than on a winning streak.