In too many games people quit after going down for a few points. If there were no replacements the rest that would remain would have no chance to fight back and the games would end with everybody quitting. I never quit and it helps me to improve. If I loose, so what, loosing is part of playing a game. Managing to turn a game sometimes, feels so rewarding. Looking at this from another angle: If you are winning, others are loosing, was that ever something for you to complain about? Do want to enjoy the game, or do you want the game to end after the opponents quit one after another?