Yea cause the people were just a-hurtin' themselves to play some Marathon... Microsoft provided Bungie with a platform to reach MILLIONS of gamers they wouldnt have otherwise due to an oversaturated PC game market. The xbox's engine was created specifically with Bungie in mind as they were given full access to its hardware way before it hit the market or any other developers even knew what it was. They may as well have called it the Bungie Box.