The only ones who will ever say negative things about post count are the ones who don't have a very high one.
I personally don't care about post count at all, I just post what I want, when I want, when it's appropriate. I don't think it really matters how many posts you have or how long you've been on ATRL though, it's the impact that you have and the enjoyment that you get out of the time that you're on here that really matters.
A longer stay in ATRL would make one wise about its nature and aware of how to properly interact with others in an affective manner.
However, fewer posts doesn't signify lack of substance, rather a person must be intesively truthful about the statements he conveys.