to be honest, i don't really pay attention to the 'titles' people have. It's more of an e-peen stroking thing i think really, same as the stars.
A high number of posts in no way relates to their quality or the value they add to the forum/community.

A rating/ranking system would be good, but would mean alot of work on the forum owners/mods' behalf, and probably not really worth it as people (in my experience) don't know how to click two buttons and prefer to ask the mods to do something.

After reading a couple hundred posts you should quickly get a feel of who is childish, who is professional, who is sarcastic, who has tourettes etc :-)

some actually fit all 4 examples above
-Zub