@Shem just 10
He placed 20 and the other guy placed 20 (he now lost 20)he got the box with 40 for a price of 30(he now lost 30). He gained 40 from the box (he now gained 40) but still lost from placing money (20) and buying the box(30)
Except I paid a total of $50 to get the $40. I reject your hypothetical reality and replace it with my own: we do the same thing, but with positions switched so I am the one selling for $30.
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