Problem with PC stuff (setting aside the fact that PCs are x86/x64 and the 360 is PPC) is the vast array of different chipsets, vid cards, audio solutions, memory configurations, NICs, etc...
There'd be barriers to getting these 'mock 360s' onto XBox Live, which is a walled garden, so to speak.
There'd be tech support with the 'why doesn't this work on MY PC config' issues...
I just don't see it as worth their time. It might be worth the hobbyists time, but not MS'







