Low Priority Queue should be
A special queue where you wait longer to join a queue AND with OTHER AFKers.
The logic is: If you AFK'd you deserve to be with people that frequently AFK with the chance that it might happen to you. This makes AFKers feel the PAIN of what AFKing does to your team.
Also, it creates a room for gray area. Lets say your power went out and you just happen to get Low Priority Queue, you will be able to play quicker and get OUT of Low Priority Queue QUICKER and back into regular queue where you belong.