Could it be that players play the way they want and the score is a result of their gameplay, that their gameplay is not a result of their score?
I think there are far too many that think that most people play for score.
Look at it this way, I normally have a high K/D because I don't like being shot down, not, I don't like being shot down because it affects my score.
Or, I have a low K/H because I don't care about instant action and enjoy going up high and hunting, I'm not doing it to have a low K/H, it's a result of how I play.
Maybe the 10 ten guys are there because that's how they play, and their score is a result, not a goal.