yea, your equity sux against the most likely holdings JJ-KK. But I think players will attempt to semi bluff AA off this board, therefore I think a call is mandatory on the river against hands like AK,TT, heck maybe a sneaky medium pair. Against good tricky players, I think you should pay it off. I think you can get away from it only against predictible TAG opponents. Where you've never seen a reraise lower then TT or AK.