In Dave's scenario payouts are $50, $30, and $20. Suppose everyone goes all-in the first hand, he looks and sees AA in the BB.
He calls and wins 30% of the time against 9 opponents. His EV is $15.
What happened to the other $50? Shouldn't it be split across all the "second" place player, giving him an ev of $18.88 total?
If he folds (barring ties), there will be one remaining opponent and his EV is $30+
How about this one: you've got AA on the button, UTG jams, everyone calls.