The Wii U controller is really interesting to devs. If you were in the business of creating games, and suddenly you get the option of using this new screen in a new way, without sacrificing graphics, you'd be onboard too. People are excited to make games like this. It's what keeps their job fun.

Easy , money and developers know they will make profits on Nintendos system the wii is living breathing proof. Also iv'e heard it intrigued them and they are intrested in how many unique , creative and dynamic games and ideas can be done with it considering it has so much diversity . Playing with the wii mote , classic controller , gamecube controller , Wii U controller etc . Or a combination of any of them