I see it as a measure of forum activity; someone who's only been around for a couple of months but already has 1,000 posts is much more active in the community than someone who has twice that many posts, but has had an account for two or three years. About the only time I trot out the post counts is if some guy who has been around for ages but has a very low post count starts jumping in on community arguments while acting like they own the place because of their join dateit's happened; I'm talking about things like the minor controversy over Dragon Age II having made the 12 games of Christmas list; there were a couple of early join date, low post count users shooting down anyone who suggested there was something off there, acting like they were more knowledgeable about how the average user felt about the game than the people who had been posting several times a day for the last year.. Other than cases like that that, it's mostly just an indicator of activity; as long as a user who clearly isn't very active isn't claiming to know the community better than those who clearly are, and as long as the poster doesn't make an exceptionally large number of posts in an exceptionally short amount of time, I usually don't notice the post count at all.