Here I am trying to unearth something that would I hope definitely open your eyes. Did you read the post published on MAJOR NELSON that was mentioning the Gears of War promotional ad (720p and 480p)? The ad will be available on Xbox Live Marketplace for Xbox Live Gold members only. Why Gold only and not Silver????

Later on, one more news burst that said the demo will be available on Silver but one week later.
I think there is a divergent-strategy by Microsoft that is passively impelling you to convert or upgrade your gear or go for Gold for latest tailors or you can say for all latest launches since the Gold is paid accomplice while Silver comes for free of charge.
Via: xboxic