This reminds me of my favorite Twilight Zone episode ever, in which a no account loser gained the ability to trade physical and metaphysical qualities with others, voluntary trades only of course.
He traded his broken arm for an old man's cold, his youth for cash (and then bought back youth for pennies on the dollar, a year at a time, from foolish young people), and purchased the conscience from the saintly father of the woman he loved - so that he might become worthy of her. Of course, without a conscience, the father of the bride murdered him later.
Ever since seeing that episode as a kid, it has always been a recurring theme I've enjoyed tinkering with; I've just never really had the opportunity to play The Bargainer, as I tend to think of that power/archetype, in a game as of yet. I think it would work in a supers game though, just be weird as heck.