p.s. - post count does not seem like a useful metric unless one takes quality of post into consideration. then again, grinding for score is not necessarily telling either.
Post count usually correlates well with Forum Age, and any time it does not is either not a problem or a potentially bannable offense (spam).
The older the Forum Age the more the community can rely on that member to participate and remain.
The more time you spend cultivating something the less likely you are to abandon it forever.
And this is coming from someone who has had their Personal Message as "Doesn't post just to post." for as long as I can remember.