Not many. Most would buy second hand cards or use what they already have or if they would buy new cards they wouldn't buy expensive ones and Nvidia would still loose money in the end. As for your second question. Did they pay that full price to Nvidia? As I see it, it's very simple really. PhysX is a technology owned by Nvidia. If you want to use it, buy Nvidia hardware! You can look at it in another way. PhysX is free, Nvidia doesn't charge anything for it. You can look at it as a gift to their loyal customers.
If you buy anything from their competitors, it sucks for you! No more treats! 
I don't see anything wrong with that. It's just some explosions and bling really. I don't see what all this fuss is about. You guys all have ATI cards and on every occasion you have you bash Nvidia on the internet. Yet here you are crying like little kids: Nvidia doesn't give us eyecandy. Boohoohoo!
Haha!

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