I am afraid this is the similar mentality in the Linux world in the past: this place belongs to l33t only, n00b are not welcome here and will be told to RTFM. That mentality prevented Linux from being adopted widely until more and more n00b-friendly distros are developed such as Ubuntu, Zorin OS, elementary OS, and etc.

IMHO, the post approval will only make this group more exclusive and will send a strong message that this group is l33t. Maybe you should change the name to WordPress l33t Group.