Hello guys, new here and just felt like posting.
When talking about these sales you have to consider a few things.
1) Like someone already stated, many people have bought multiple 360s because of failures. I had to do this because my first system was no longer covered by the extended warranty. 2 systems, but only 1 copy of any given game. We will never get any numbers not even ballpark, but many people have had to do this.
2) Piracy is rampant on the 360. Games are literally downloaded by thousands upon thousands of people (way too many to track), and this doesn't include people who buy copies from pirates (how most pirates get their copies). The only way you can play games on a PS3 is by actually purchasing a copy.
3)Many people own PS3s just for BlueRay and nothings else.
What I'm trying to get at, we're never going to have a clear picture of how things really are just by looking at the install base. So arguing about this isn't really going to go anywhere.
The only game that surprises me is Tomb Raider. I bought it and liked it, but I usually hear people ragging on it pretty badly. I think it needed more time for de-bugging and polishing, but I thought it was a good game.