ok, so when it's a coin flip, you're willing to sacrifice many ev's to cut variance, so let's try a less variant scenario.

Scenario #2

same hypothetical person from before. same circumstance that this is going to be the only time you're going to play the game, etc etc, ldo.

You have 6 briefcases left and are being offered n dollars for your own briefcase. if you decline, you will be offered another deal after opening 1 more briefcase.

the possible amounts that are left are:

$400,000
$75,000
$5,000
$500
$75
$25

now, how large does n have to be for us to accept the deal?