An XBOX 360 port of a particular game is a little more expensive than that - it's about EUR 25K, dependent on the script size and some other properties of the game. On the other hand, it's not a year, but about 4 months. When your game is ready, you can contact Support for a quote. You'll need Microsoft approval, of course.
On a related note, could you give some kind of estimate for getting a GS game to use OpenGL and Cg instead of DirectX and HLSL? And if someone was to pay you to do that, would GS be cross-platform from then on?
I'm not exactly rich, but a lot of people have asked for a Mac or Linux version of KarBOOM (even at this really early stage), and who knows, maybe one day I will have money

Jibb