Very rarely have I ever bought a third-party game on any of my Nintendo consoles.
The rare exceptions would be Mortal Kombat Ultimate 3 on SNES, RUSH 2 on N64, Sonic Adventure 2 Battle on GameCube, and I think I bought maybe one or two for Wii but I honestly can't remember what it may have been. It's possible all of my Wii software is first/second-party only.
But suffice it to say, from the people I know that are Nintendo fans, since the PSone era through to the present day, and especially since GameCube, most Nintendo fans that want a third-party game will tend to buy a PS or Xbox to play it on.
Just the nature of the beast. Nintendo consoles are amazing because Nintendo creates amazing games that you can only get on their systems, but it's a blessing and a curse. It's very difficult to justify buying Call of Duty when there is a new Zelda, Smash Bros, or 3D Mario out. I will always opt for the Nintendo sequels.