This seems to be a general problem of Nintendo, I think.

Someone told me, you could release your game on Sony console and simply get a factory to produce your game discs. While if you wanted to get your game on a Nintendo console, you had to let Nintendo produce the discs for you in their factories, because of quality control reasons, which slowed down the release process and also filtered out many games of companies who didn't want to stick with Nintendos release rules.

But I don't know how much of this is true...