
Originally Posted by
Shojin
US has a shitty tracking system for sales, unlike Japans Media Create and Europes Chart-Track.
NPD only release the top 10 games (think they lowered it to 5 now) to public and they release monthly instead of weekly like other parts of the world, so VGChart is the best thing you will get short of NPD releasing LTD sales, or the publisher.
EDIT: And I have to say, NPD only includes US sales, VGChart supposedly include Canada sales in with 'Americas'. I'm guessing latin americas too, but I doubt that would make a difference much.