It likely isn't fiction but I doubt those scores will ever be repeated. Scores so close that they yell bottleneck and the card needs better drivers anyway.
I don't think theyll be too much. I can see the 9800GTX which is just 800GTS 512 being a bit more, say $50ish, and same goes for 9800GT which is 8800GT repackaged.
I would say that GX2 would be double a single core card but 3870x2 stuffs that up, so maybe 1.5x price of a 9800GTX?