I think Cholula's initial post gave the best reasons for maintaining the post count. Others who might use the count as a metric on "worthiness" are at least occasionally missing the boat in my opinion. I log in every day, several times. There can be a certain cliqueishness (is that a word?), or if not that there are clear alpha dogs in the various forums. Further, there are some people whose posts are almost always the same (e.g. "go do a search", etc.), and thus post counts don't truly measure their worth.
So, as a (mostly) lurker, I have a pretty good feel as to who knows their stuff, and who "contributes" in the forums I frequent. I can appreciate that the frequent posters would be unfamiliar with me and my opinions, so I suppose my 180ish post count tells them.. something. Leave it be.