Why the Scorpio will sell for no more than $399 (if its 6tflops).

[aquamaennerz]

it will be $499 and will be fine.
the xbox one including kinect sold fine for $499 5.1million units in the first 5 months

and the xbox one including kinect had very bad word of month and press.
so the most powerful console ever will do fine at that pricepoint.