Gnizmo on 22 May 2008
Considering that far more retailers than just Gamestop sell the systems, and we don't have a hard number to pin on the sales of the two systems at Gamestop before or after the release of GTA 4 this means nothing. NPD tracks many different major retailers and this is just one of them giving qualitative data. Even still, NPD never claimed there was no spike after GTA 4. They claimed it was not as big of a spike as you would expect. For all we know they had both systems having sold 90k the week before GTA 4 and then sold that many again in a week.
In short, you have done nothing at all to contradict anything NPD has said.
