$22: Push or wait with an uber short stack

[ZeroPointMachine]

ICM assumes that all stacks are equally playable. It doesn't give you an extra dose of equity because you have a monster stack and know you can steam roll the table and it doesn't subtract any equity when your stack is so small you have no moves left to make.

It calculates finish distribution based on relative stack sizes and your equity based on payout structure.

I would argue that when your stack is really small this model over values it.