Ouya is yet another Android variant. The amount of work porting isn't like porting from 2 completely different platforms like 360 to PS3 or iOS to Android. This is just from one Android device to another. Plus it's not like Android devs don't already have experience with dealing with Android fragmentation. There are also plenty of Android devs who don't get enough attention on the major app stores. For just a little more work in porting from one Android variant to another they can have a whole new venue.