Because it isn't. Well, I guess it depends on how you determine it. Compared to GT in Europe, it isn't. And that isn't compared to Europe's solid numbers, but GT there compared to other games. It's complicated, yeah.
GTs (on Ps2) in the different areas
GT3:
Americas: 3rd best selling (although heavily bundled)
Others: 2nd best selling
Japan: 5th best selling
GT4:
Americas: 15th best selling
Others: 3rd best selling
Japan: 12th best selling
However, we have to keep in mind that this is really wasn't rather than isn't.
GT is large in all the 3 regions. I believe most people claim that it is just smaller in Americas, not small.







