@vladimir: It's a one-off.

@vuce: So you would accept that the other guy keep $5000 and you $0?  Technically (and again, assuming we identify utility with monetary payoff, as you seem to have done), that is a Nash equilibrium too: rejecting the deal would hurt the other guy while netting you nothing.

@db: That would be the exact same deal, with a different framing.  My guess is that if you did a parallel study, dividing the subjects in two halves and asking either question, you'd get significantly different results.  Ironically, I think your framing favors the first guy.  Guess why?