I like that they have a spot on their social hierarchy for guys who don't give a shit about social hierarchies. It's giving "Jimmy thinks our club is stupid, but we think Jimmy is cool so we are saving him an honorary spot in the club just in case."
If a dude told me he was an "omega" male, it would take all the forces in the world to stop me from unleashing the KNOWLEDGE I bear unto that say about ABO >w>