So, i was searching the staff list and noticed that Mod Zexion has 300+ posts..
I viewed all the posts but saw only 14?
No offence to Zex
There are other sections of the forums that you can not see or access.
Any posts made in those sections would be hidden from you on their profile as well. =)
Like Jazmen said, There are staff only boards where the Staff discuss.. well Everything that isn't deemed publicly viewable. Don't worry about their post count's that much.. ;)
Ex-staff, ie: Collin, also still have this affect on their account. If they have prior posts in those sections you can't see them. Strive hard to become a staff member and you'll see them.