Okay I'm a bit late to the party, but I wanted to throw in my two cents. I also like the idea of having a Raspberry Pi export. I don't think there's a commercial market for selling your game on that platform (and maybe not ever, as it's more of a "maker platform"). However I like the idea for a few reasons.
First is just simply because it's cool!
Second is that it could open up some more doors for makers, embedded games, and other interesting contraptions. For instance, you could make a game where an old exercise bike is used as the controller (something akin to the old Paper Boy arcade game maybe).
I think it would be cool to see your game running in an arcade cabinet. Granted you could do that now, but you'd have to have a more expensive computer (mini-ITX board or the like) running inside.
A few days ago, I was talking to some of my indie game dev friends and they had talked about the possibility of showing off their games at conventions inside of arcade cabinets. Still a bit costly, but running them on a Pi could help bring those costs down.