I mean, have you seen this thread?
http://gamrconnect.vgchartz.com/thread.php?id=231643&page=1#
According to that thread's data by just looking at the top 5, you have 5 Nintendo games which have sold 30 million total copies.
Looking at every single other game, including #6 which is a game with Mario on the cover, has a combined sales of 17.6 million copies. Meaning that the top 5 games account for 63% of the retail sales and the other 87 games account for 37%.
Sure looks like only Nintendo games matter. That's not me. That's just data. There is no parity. It's Nintendo games or bust. Or you can be like Ubisoft and throw Mario on the cover to get some sales.