Sometimes having the Junior Member tag means a mod took away part of your posting privileges, meaning you can't post new threads, only reply on them (this usually happens when you make 1 or more
really shitty threads). When you see a member with more than the required amount of posts but still being a junior, that's the case.
blame space, here's the probable reason:
http://www.neogaf.com/forum/showthread.php?t=363433
Annihilator, if you get to 200 posts and you're still a junior, don't fret, I'm under the impression that the minimum posts required number was raised some time ago (maybe to 300) and the FAQ was not updated.