I personally have no idea if MS banned 300, 600,000 or 6,000,000 consoles, but either way to suggest that 1/2 of them ran out and repurchased their 360 is more than a bit extreme.
And why is that?
The ban was executed just before MW2 launch, MW2 is purely a multiplayer game. The only way to not stay behind the crowd is to buy a new hw unit.
But I suppose this should be going to http://forum.beyond3d.com/showthread.php?t=55611