Making me feel inferior over here with my post count! :P
Post count is useful depending how it is implemented. The vehicle forum I frequent only increments post count for posting in the technical/mechanical support sections. It becomes easy to pick out those that are very helpful by post count.
There is another forum I work on that post count means squat and they turned it off to not encourage spamming for a large number.
This forum... Not sure! :P I believe post count is incremented every where.