your mother said:
No idea... but that doesn't change the fact that attach rates are the number of games that are sold per console, right? If that's the case, to get the real attach rates of a system you have to compare numbers sold. I'm not sure about this either, but if developers make money off of royalties or the number of games sold, then it would be relevant to only assess sold-through rates; otherwise it would be the retailers that are technically paying the developers their commission! But again - I'm not sure - perhaps somebody could clarify?
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But in the long term, shipped = sold, so it's kind of irrelevant, isn't it? And with the PS2 being seven years old, the number of games sitting on shelves in video game stores would be rather small compared to total software shipments.
Here are some Sony links. The PS2's shipped attach rate is around 10.5.
http://www.scei.co.jp/corporate/data/bizdatasoft_e.html
http://www.scei.co.jp/corporate/data/bizdataps2_e.html
Approximately 1,240 million shipped for software and 117.89 million for hardware.







