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psrock said:
FADE LLC estimates 2009 revenue exceeded $100 million USD for Arcade titles alone, not including downloadable content, community games, or games on demand

Arcade titles would be XBLA.  The WiiWare & VC figures also don't include DLC.

I also doubt Xbox Originals (criminally underserved imo!) or Indie Games are bringing much in.  Games on Demand might be though.