By using PM, you greatly limit the amount of successes this thread could have.
Think about it, if you post here, every new member of the group also refreshes the thread and pump it upwards back to the head of the list. But if you accept new members by PM, you do get some new members, but the thread is not poped up and therefore they will cease coming.
So if I where you, I would edit the thread so that new member applications are accepted only by a post here with the KiK of the new member, or just by a raise of hands here and passing the KiK by PM.
Speaking on that, I would like to join as a master for girls only.