I apologize. We didn't realize that your sarcastic statement was NOT the following:

Right some guy at Gamestop said it.
And, in fact, was the following statement:

God you are all so stupid.
Essentially meaning, it is true because a guy at Gamestop said it, and we are all geniuses for believing that.

As for how much the Gamecube sold when compared to the X-Box, I doubt it was as far as in the millions of difference, but I do know there's some kind of record-keeping site of Video Game sales, but I forget the site name at the moment. Does anyone happen to have the link?