It's called a sale. Games go on sale and often shortly after they're released. The game is nearing half a million in sales once numbers are released for the last week. There is no doubt the game will hit one million and I think two million is likely. While that might not compare to GTA3 and after, how would it stand up against similar GTA games like GTA 1&2?
I've lost a lot of faith in Nintendo appealing to the hardcore fans but at the same time, I'll give my honest opinion on the matter. What I won't do is look for endless things to make threads about to try and rip them. At this point in the life of the DS and Wii, we've seen countless games debut relatively small only to go on to become massive hit games. I made a thread to prove exactly that point (at least for the Wii) a couple months ago.
I'll come up with something better eventually...
