Why are people even clocking them? It really depends on the content you are typing too. I can type at a very good speed on topic than I am familiar with, but most the online test feature articles than I have never seen before and totally outside my style. It is just rather pointless, just like KDR in games and such.
It's more of things you're familiar with lets you type faster. Typing tests like TypeRacer, TyprX, or whatever you use test your reading too along with typing.