Hmm interesting read. The only disagreement that I would have with this analogy is that taking the GMAT is not entering into a legal trading contract by taking opposite sides of a bet with a counterparty.
Ie for you to take a profit by buying a call option in the financial markets, the counterparty who sold you that option must take an equally-sized loss (discounting fees). Conversely if you take a loss by buying that put option, then the counterparty that sold you the option would take a equally-sized profit in that trade.
Of course by taking the GMAT, going to business school, and then making lots of money from your successful career, GMAC doesn't actually lose any money as a result of all of your successes, which is why the analogy is flawed.
Anyways interesting read, thanks for sharing, and kudos for the post!