DEAL or NO DEAL (TV Game Show) How Decide?

[LerkEr]

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Banker's offer in the US can also be +EV. I saw a show last week with $750k and $10 remaining, the offer was $400k.

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this is stupid i know but there is a slot machine in the U.K i was in the pub last night playing deal or no deal slot.
i got on the board and got down to the final two boxes
£10 and mega streak (mega streak pays about £80)
the banker offered me £25, i think that offer is -ev so being the prick i was i didn't take it and the box was £10
my conclusion bankers offer is -ev