Well just look at other systems.
The PS3 game with the most hits (MGS4) is owned by less than 4 million people.
The highest ranked PS2 game is owned by a lower fraction of its userbase than Galaxy, Brawl or MK:Wii.
Ignoring the people that just bought it for casual games. There're people that just don't like Mario platformers or Kart, nor brawl. Maybe they're fans of fire emblem, Zelda and Metroid







