Picture a rug (a blue premier access rug if you wish).
Now picture a gold (or even silver member) on that rug.
Now picture someone pulling that rug from under their feet.
Thanks UA.
('At least' group 2 doesn't include E+ as alluded in the consolidated boarding process thread)
Edit: Agree in principle with LordTentacle, but can't even begin to imagine the hassle that would be to implement.