I think this mostly depends on the varierty of games being made available. If a console has mainly bigname shooters, naturally this would mainly attract shooter fans and a new bigname shooter may well enjoy a similar attach ratio. If a lot of different gernes are being served, a platformer fan may not enjoy shooters, those who like a singing or music game may not be a big platformer nor shooter fan, etc.

Hey godbless I only named games releasing directly before and after GTA4... when do those games release again?

Ninja Giaden in June.... which is arguable if its a system seller or not. hm... and then games in october/november.

i see first week of gtaiv like this:
gtaiv 3620 version selling more than gtaiv ps3 version
ps3 selling much more than 360

The PS2 install base is over twice as big as Wii, PS3 and 360 install base combined, so most people seem to be patient, to a Metal Gear Solid, Gran Turismo or Final Fantasy fan a game like Halo, Forza or Gears of War may not be very relevant with regard to their console purchase.

Also many millions of (former) XBox owners in Europe as well as in North America still haven't upgraded towards the 360, this after nearly 3 years and most importantly despite nearly all the big million selling XBox games have already seen sequels on the 360. (Halo, Splinter Cell, PGR, Madden, Ghost Recon, Call of Duty, Dead or Alive, Need for Speed, Forza Motorsport, etc. Only Fable, Star Wars and GTA are remaining of the million-seller XBox sequels!)

Why are many millions of (former) XBox fans so patient then? I think some may hope for hardware issues including RRoD to go away and/or maybe hope for a significant pricecut (although in Europe this had little effect). Content wise nearly all the big XBox names are there plus a few new heavily marketed games like Gears, BioShock, Kameo, Assassin's Creed, Mass Effect, etc).

Umm... You do realize that individual game attach rates almost always fall as a console's installed base increases right?  For example that's why there are no game for the PS2 that are even close to having the same attach rates as the Halo games on Xbox.  In order for that to happen they would have to sell 30 million or more copies.  You seem to think that it's amazing that it's happening for the PS3 when it's not.

*Edit: Oops I guess someone else already brought up this point.

@ Legend11

I already shared my perspective on this above, I think the provided game gerne diversity plays a significant role in this. Also the amount of choices within one gerne affects this, for example if 10 shooters are released simultaneously, they will compete for sales as nearly nobody buys all ten of them at once, if ever. The best hyped or most anticipated game will then likely sell best. Halo sales wouldn't suffer and may actually benefit due to more shooter fans moving towards the platform, the other 9 will probably hurt significantly.

So Lazard thinks that the 360GTA will outsell its PS3 counterpart by 60:40, by 1.5:1 in other words? Ain't gonna happen. Yeah the PS3 is slowly gaining an edge, and the 360 ever so slowly losing the edge it used to have, but it is still outselling the PS3 by 2:1 in the US.

Sure, I wish that the PS3 would do that good but I think that this conjecture is highly doubtful.

The comment regards the first two weeks of sales. Christmas sales for example may show entirely different ratios.

A lot of the fan base for the PS2 went to Wii and 360. They go where the games are at.

I think just a few, like I said before the PS2 sold over twice as many consoles as all next gen consoles currently sold combined. And buying a 360 or Wii does not per se mean such people will never own a PS3.

With nearly all the big XBox games already on the 360, this IMO resulted into the bulk of XBox fans buying a 360. Many millions however are yet to do so.

The Wii is IMO best suited for young kids compared to the other systems and Nintendo tries to attract many new gamers with games like Wii Sports and Wii Fit. I think not the type of games the hardcore gamer really wants compared to Grand Theft Auto, Metal Gear Solid, Final Fantasy, etc and vice versa.