Originally Posted by
DYKWIA
This is similar to the at airport upgrades. If you've used this too often, you get blocked.
Difference being - AUPs are voluntary! So you can choose when to exercise your AUP allowances.
Half the time - you won't get a choice about an Op-up and trying to decline it will result in someone saying 'sorry - we've already allocated your old seat'.
Seems a little crazy to put a limit like that to me - but equally it wouldn't surprise me if they are using such a blunt tool.
I'd like to know the source too.