They have too much money to spend
.. One card should play all the games *now* decently.. I guess its more futureproof.. But, why not buy the 2nd card when u actually *need* it is beyond me - when its cheaper.
But, on the plus side, when u go to a club, and say that "I am running 2 x 6800 GT's", you'll get all da ladies
Try it next time!