There is no set number of posts looked for with a new staff member, but more about how long that user has been around and what they've done in that time. Most of the mods you see with few posts may be from one of our sister sites. As there are 6 forums ran by Nick, moderators do sometime share privileges on different forums, and Administrators have full access on all the forums. That may explain the moderators that you see with low post counts.
