Even if they did make a difference, why remove them? We've clearly earned our post counts, otherwise we wouldn't have them.
I wouldn't say people treat users differently based on their post count. I would say there was perhaps a little more respect for the members with larger post counts though. Which again, they have earned.
I think its mostly the user name that makes the difference. After posting here a while you get to know who the main players are y0. Do you think Fox would be brushed aside as a worthless spammer if he had only 24 posts? Do you think twoblacklines would be seen as a well respected person of the forum if he had 24,000 posts?