@S.T.A.G.E.: Um... You apparently don't understand what attach rate means at all. Simply put, it's the number of software sales per system sold. Every time a game is sold, attach rate goes up; everytime a system is sold, it goes down.
You can't always make assumptions about the systems' demographics based on attach rate. For example, say that you and I are the only two owners of videogame system "XBogus3". If I own two games for the system and you own zero, then the attach rate is 1 but only half of the user base consists of gamers. On the other hand, if we both own one game then the attach rate is still 1 but the entire user base consists of gamers.
Your belief that only a quarter of PS3 owners are gamers is simply absurd. You questioned why it is that no PS3 game has sold to even a quarter of the user base but don't seem to realize that it is extraordinary (and not necessarily indicative of a healthy console) to have a single game sell that well. No game sold that universally on PS2. VGChartz has the top-selling PS2 game as GTA:SA which sold almost 18 million copies worldwide. Fantastic sales, right? Well it sold to about 15% of the console's lifetime base. Over 100 million PS2 owners didn't buy it. Those people must not have been gamers, right?







