It is true that attach rates do not tell the whole story. You need to account for the fact that the consoles have been out for different lengths of time and sell at different rates.
Dille says something to this effect, and then tries to compare attach rates anyway. And only for a small handful of games.
For a better look at how the consoles differ in software sales, try this:
http://www.vgchartz.com/forum/thread.php?id=66975
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