So the Wii is a console mainly for casual while the Gamecube was driven mainly by Nintendo fans thus the relative low hardware sales.
Smash Bros Melee for GC is the best selling game on the system with 7 million units LTD ( source: Nintendo ).
Smash Bros for Wii isn't the best selling game for the platform but it has already surpass the sales of the GC episode in 9-12 months. Currently it has sold around 8 million copies ( source: Nintendo ).
Very few games in whatever system or time can sell that much.
“In the entertainment business, there are only heaven and hell, and nothing in between and as soon as our customers bore of our products, we will crash.” Hiroshi Yamauchi
TAG: Like a Yamauchi pimp slap delivered by Il Maelstrom; serving it up with style.
