As MMnin said, their conclusions are based on the wrong info. We are interested in new things otherwise we would not have the franchises we have today. But what makes an original push upward? That's a question.
With PoP and Mirrors edge it's easy. A combination of public/demographic, timing and reviews.
Who where going to be interested in Pop and ME? Us, the people online who watch gametrailers for our future wishlist.
Then who starts to watch reviews online? Us again... Adn we noticed two things: PoP was to easy, and ME to short. We gamers combine this with the fact that our budget only allows for one, maybe two games (or parents are only happy to buy one game.)
And indeed, with timing as Fallout 3, GoW 2 etc comming out, we prefer to spend our money on a game that's worth it's mone in measures of enjoyment, time spent, etc.
The Doctor will see you now
Promoting Lesbianism --> 
