When we have greediness, that will make us get more losses because greediness is a feeling that wants to get more, but we don't know how big our chance to get it.
Correct. Greediness will lead us to more losses because the chance to win is always small. That's why some people prefer to stop when they already won it. I think this is the right way as if you continue to play more, contrarily your chance to lose will be higher. No guarantee to win even if you make many attempts!