Shintai,
Dunno what you're going on about - ofcourse the profit from single 9800GTX is greater than of a 8800GT. But you can be sure that the sales volume of 9800GTX (~$300) is totally insignificant compared to 8800GT/S ($175-200) thus the latter brings more profit in the end of the day. Unless you can post some numbers...

Selling G200s @ $500 (or w/e) will be very, very bad business for nV... On the other hand, HD4870 will retail at much lower price thus more people will buy it. Volume is what matters.