If we think our opponent is decent, we have to consider the greater likelihood that he calls raises in position with hands where he knows where he is at (pocket pairs, suited connectors), than hands where he doesn't when he CALLS a raise (non AK/AQ broadways like KQ/KJ/QJ/KT/QT, where he could be crushed by AK/AQ).

Think about when you get someone's whole stack with top pair, good kicker...its when you think your opponent is on some sort of bluff/semibluff...which is far, far less likely when there is an all in player with a main pot...and you'll have to show your bluff and likely lose the main pot.

I think this is a clear situation of win a little or lose a lot with your AA. Your opponent has a hand where he knows where he's at the vast majority of the time, he has position, and he has a situation where you aren't likely to be bluffing if you bet. Ideal situation for him, crappy situation to you...don't price him into it. You know where you are at now...take position away from him.