360 attach rates

[Bodhesatva]

Honest question here: does any system, in history, have an attach rate better than the 360? I know it's hard to calculate right now, but it appears to be around 6.1 per console. The PS2, to my knowledge, is stuck around a 5.5 attach rate, which is still quite good -- but given that attach rates do tend to increase over the course of a system's lifespan, the odds are that the 360's attach rate will continue to increase its lead on the PS2.

So, again: has any system ever had a better attach rate? And quirky question: is this absolutely a good thing? Obviously there this high attach rate is mostly good, but is there some kernel of badness there? The spectacular sales of software, combined with the lackluster hardware sales is... odd, very odd. Could this high attach rate have any downside at all?