regardless of what some of us may think about Kameo and PD Zero(as of right now)...
I see MS making back the $$ they spent on Rare a lot sooner than we think.
PD Zero will launch in all territories and will sell a Million or so copies REAL fast.
Kameo probably wont break the 500,000 barrier, and if it does, it wont be for a while. But thats still $$ towards the initial buyout.
The best case scenario is PD Zero does what all the fans wanted, and MS just got another First Party killer app to add to the stable along side Halo.
You can't put a price on that, just look at the Bungie ordeal