With regard to the $500M marketing budget.
Quote from MS ""The Xbox 360 team created a multiyear, integrated campaign showcasing real people at the heart of the experience," said Mike Delman, corporate vice president of IEB global marketing, Microsoft. "Kinect puts consumers at the center of their entertainment, and our marketing efforts follow that same charter.""
From the following article http://www.earthtimes.org/articles/press/controller-free-games-launch-november,1506402.html
Its libraries that sell systems not a single game.







