Its all Green vs Red, personal preference, i would suggest a larger percentage of customers don't know the in's and out's of the products they are buying. Places like PC World, its packaging that attracts people, and what the "Tech Guy" tells them to purchase. Its a smart move on nvidia's.While it maybe a smart move to update your current graphics chip if it results in a card that counters its oposition, this is clearly not the case with the 260 though at least at the moment. It resulted in a card thats more expensive and still carries the same name as its older tech resulting in confusion for the customers.
The new 260 is currently around the prices that the 4850x2 will be and that means that its going to be totally outclassed soon. So really this move by Nvidia is totally mute.