I just thought of a potential problem with this idea that no one else has mentioned. Let's say I'm an MVPG (which I am). I've reserved a seat on a flight which doesn't have enough open seats in F to allow me to upgrade. I want to make sure I'm comfortable, so I reserve a seat in North of Coach. But I might like to really be in F, so I put my name on the waiting list. If I'm out of my yearly North of Coach freebies, or if AS doesn't give out freebies but rather discounts the section for MVPGs, AS at this point is due to collect an additional $50-100 from me. But if my upgrade clears, then I go into F at no charge and AS misses out on that additional revenue. Hmmm...