Gt5 prologue has been sold 639k for his 1st week

Exactly, it's a much smaller group of people whom are buying. What is going on with the other 15 million console owner who have PS3's?

what about the the other 20 million console owners who have a 360?

Attach rate, as I look at it, shows two things:

1) the popularity of a title with a console's install base

2) the general spending power of that console's install base

360 and PS3 both have pretty small install bases (compared to say Wii or PS2 at this point in its life) and as such both should see pretty good attach rates as if a console sells really well, and covers a lot of demographics, the attach rate should drop.

The 360 however has a few advantages over the PS3 IMHO:

1) it does have a number of titles that have/will sell beyond the average PS3 (and PS2 before it) title - titles like Halo, Gears and COD on a small install base are going to skew the figures for attach rate

2) it has a one year install base lead, which means that it should see a better attach rate for most multiplatforms unless they skew particularly to an audience that is underepresented in its ownership demographic

3) the above 2 points are further magnified by the 360 advantage in US and the fact that it has (I believe) a larger presence in the most high spending group of owners (teens/younger working males) than PS3

Attach rate isn't part of getting customers, its a measure of how you're doing with regards to the attractiveness of your range of games to your owners.

To get customers PS3 needs more exclusives, a lower price and more of its most popular franchises and genres.  The challenge is the 360 already has taken a fair share of the potential install base while MS has used money/smart relationship building to fastrack exclusives and in many cases buy them.

Again, though, when I think it through I don't really get the OP.  I mean, if the PS3 was seeing the same big sales for its main titles then it would probably be outselling the 360.  We know its not, we know the difference in territory splits and genres so its a given that for the most part its titles will see less sales than 360.

360 userbase have proved over and over again that they buy loads of software, there wont be as much software sold as the on Wii (due to userbase) but the 360 is a software monster? Why? I really think that majority of 360 owners are keen gamers, that are able to put loads of time and money into gaming. Plus Gears and Halo are parts of very popular genres that have good marketing and hype behind them (especially in the US)

Obviously not Halo 3 fans and it's been predicted that Halo 3 will have around 11 M games sold by the end of the gen. Imagine the numbers Halo 3 would've had if it was multiplatform, it would make Rockstar games weep. However...Halo 3 had about 7-8 million Halo 3 games sold around the 20 m console mark themselves, so that still isn't saying much for Sony.

If you ask me one of the real reasons I believe millions of game sales are being lost is because Gamestop recycles games and makes profit off of them. Everytime you buy a used game a gamestop, companies lose potential money and gamestop makes more. This is another glitch in the gamesales market.

I was referring to VC since the database shows it slightly ahead of WKC.  It's true that so far WKC is only out in Japan, but I wouldn't bet on it putting up huge WW numbers.

That 2 million unit advantage means there are 3x as many PS3's as 360's, why doesn't the PS3 sell 3x as many JRPG's?

But LBP had the most hype of any game iv seen,then KZ2.

Excuse me, but WTF are you talking about?

I think part of the reason is that the tastes of ps3 owners seem broader than 360 owners. I'm too lazy to elaborate. It seems like no single game can see appreciation from a vast majority of ps3 owners.