Xbox 360 owners eat games for breakfast in the US. That's just what they do. The attach rate is going to increase for this quarter.

 Also, here's some statistics on XBLA for NeoGaf posters:

They have spent on average $98.20 on XBLA games per user

They have bought on average 13 XBLA games. (13.47 actual)

Now Neogaf will have more hardcore players that isn't quite as representative of the whole installed base for the Xbox 360, but it is a good indicator of where the attach rate for XBLA games stands.  My guess would be between 7-10 games per console sold.  The sample size is 735 people in 29 countries.

Eh, at the end of the day. Total software sold is the only number anyone cares about. So the 360's killing on that front.

I mean the gamecube had a MONSTER attach rate. Why? Because mostly only Nintendo fanboys bought it.

Attach rates really just show how "hardcore" your audience is... which really is a bad thing, because it somewhat implies that you arn't hitting that casual/mainstream audience that just doesn't buy more then a few games a year. Which, while they don't contribute as much, they still count... and are what are going to sell the most consoles.

Would you rather sell 100m consoles with a 3.5 attach rate or 60m consoles with a 7.0 attach rate? For some reason Dev's and Pub's really like that number a lot. ;)

See the Gamecube vs PS2 publishing history for a similar question.  I've also never seen Dev's and Publishers talk about attach rates.  However I have heard Dev's and pubs talking about not being happy at a systems number of sales.

Any company would rather have 50,000 and a 10% attach ration rather than 40,000 sales and a 30% ratio.  So total software sales is all that matters in the end.

Attach ratios are pointless when trying to predict future sales because those new customers are going to drastically alter your attach rates depending on what part of the audience you reach.  The larger group of people you reach the more it's going to drop.  The ratio will grow when the catalogue grows and good games start reaching discount prices.

In large part your attach ratio is going to a product of the number of console sales you have and whether you just hit your hardcore users or the mainstream.

I just wanted to agree with this 100%. Console attach rates mean almost nothing, I am pretty sure no company takes these into account when releasing a game.This whole thing about attach rate is a useless discussion. For instance if we accept SimExchanges predictions for consoles (Wii 100+, PS3 Xbox360 50), in order for a game to make money they will need to sell for example 400 k on the wii and 550 k on the PS3/Xbox360.(Because of higher development costs). They do not care about the attach rate of the consoles, because the Wii with the numbers above, would need less than half of the attach rate of the other consoles. It really is just an invalid argument.

Yes Xbox360 players buy a ot of games, that is shown in software totals. That is the only thing that companies care about. Take Gamecube, as Kasz said, even with a higher "attach rate" it had little effect on games coming to that system.

At the end of the day you have to remember,  the Wii is not trying to have a high attach rate, it is trying to dominate the hardware sales. All consoles are. Attach rates are just a way to make the losing console feel better. Like gamecube owners will say we had a higher attach rate than PS2, which should be obvious since they were the only ones who bought it.

Someone who is spending $400 or more on a console is not your typical games; being that 75% of all game systems are sold at $200 or less so you'd anticipate that someone who was willing to spend 2 to 3 times what the typical gamers is would be far more likely to buy multiple games.

Beyond the price difference, the Wii has (by far) the largest library of downloadable games with over 150 virtual console games available and 3 new games being added every week. Probably because we have no data virtual console games are not included in the attach rates for the Wii but this certainly negatively impacts the Wii's attach ratio; if people are buying virtual console games, spending their time playing these virtual console games instead of a third rate port of a PS2 game, and publishers are making money off of the virtual console the games should be included.

The issue is the Wii hasn't actually been increasing it's attach ratio the entire year outside of Wii Play sales, if that (since it's sold to about 40% of the userbase).

Also, I fail to see why people do use the WiiSports packin as a gimp to justify poor attach rates - did the NES or SNES have the same issue with their packin games? No. Neither did the Sega Genesis.