Its true.
I happen to know a staff member who used to post 1 liners everywhere (sometimes just 1-word), in what seemed like raising their post count. However, they eventually slowed down with the posts. Cleaned up their act. Became more responsible and mature members of opticraft. Went on to become a staff member.
Won't point fingers who it was because that's not the point. The point is that most non-staff tend to post and participate in most threads, whereas the staff tend to just read and observe, only occasionally participating in threads (thus moderating the forums, one of the many duties of a staff member).
Also worth noting, non-staff are more likely to necropost really old threads than staff which is also a way to raise post count (don't get any ideas, kids!). Either that...or posting in places they shouldn't be posting in.