Y'know I only ever see attach used for games when the console has a small install base, don't really ever see it once the console is at the middle or end of its life. I think that's because attach rate isn't really constant. The absolute total sales a franchise achieves are much more consistent than attach rate. I mean sure you can praise WiiU owners for on proportion buying more copies of SC than the HD console owners did, but doesn't the fact that the WiiU owners had less options come into play?
At some point I'll have to look at some established franchises to see how consistent and meaningful attach rate really is. Sure you can make the argument that attach rate is more important for new IPs, but that's impossible to compare and I'd counter with the idea that not having a giant library of titles to choose from has a similar affect to install base.
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