Why third party core games fail(ed) on the Wii

[SnesTea]

I have a Wii and a PS3 is floating around my room (Literally lol). Anyways, I've bought a Wii "core" game made by a third party twice. No More Heroes and it's sequel. Multiplatform games I've gotten on the Wii include Rock Band 2...and that's it.

So where was the punchline Rol?