Why do people claimed only Nintendo games sell on Nintendo platforms as if a bad thing?

[SWORDF1SH]

DaRev said:

...and that is why long after those third party companies have shut up shop and their IPs have become a distance memory only to be remembered by old school gamers, Nintendo will still be around.

...and if I might add, because Nintendo doesn't have to rely on third parties for its success, while Sony does, is one of the many reasons why the 3DS is whooping the Vita's behind. Nintendo can rely on its 1st part games without 3rd party support, but can Sony or MS do the same with their 1st party games? Again look at 3DS vs Vita!

Jumpin learn off of this.

Good statement DaRev which makes a lot of sense.