[adanthar]

Well, my skill exactly on the bubble basically consists of pushing every hand into people that fold a lot, and the fun part about this particular spot is I can still do it without doubling (in fact I pushed 65o two hands earlier and somebody said they folded AJ. Cool!)

More importantly, with this particular payout structure, finishing 50'th and finishing 10'th are about the same, while finishing 55'th is very bad. If you take this to an extreme, like a sat structure payout where everyone wins the same amount, not folding aces is terrible. It follows that the closer you get away from a ladder and towards a flat payout, the more you should fold when someone that has you covered raises.

I can't prove it but I am reasonably sure this is the case unless your Z is just enormous.