Super Mario Galaxy, along with many other games, would be selling so much better if the Wii wasn't supply constrained...
Look at it like this. There are 6 billion people in this world, and we can divide them into three groups:
1- People who can't get a Wii or don't care about Super Mario Galaxy.
2- People who like SMG and have a Wii already.
3- People who want to play SMG but can't find a Wii to play the game due to supply constraints, or who are simply going to buy it later for some reason.
Group 3 must be huge, and that will cause the game to have huge legs.
My Mario Kart Wii friend code: 2707-1866-0957