Why do Wii U Owners Not Buy 3rd Party Games?

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As a Wii U owner, I've bought:

- COD Ghosts
- Sonic and All Stars Racing Transformed
- Need for Speed Most Wanted U
- Monster Hunter 3 Ultimate
- Batman Arkham City Armoured Edition
- Trine 2: Director's Cut
- Nano Assault Neo

By contrast I only own two first party games: 3D World and Tropical Freeze.