@deadlizard: the original "game" is simple in its terms, and for every one person answering, the reply is simple and even obvious.  But the psychological and social implications are varied and complex, as the variety of responses, and reactions to responses, attests.  The little variations on the game help analyze our motivations and explore that psychological space.

For example, my latest reformulations try to prove that what drives most of us who would reject the original deal is not envy of jealousy, on the basis that most of us would respond differently to the modified games.