Sony confirms PS2 has sold over 160 million

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What many of you looking at sales numbers likely do not take into account, is manufacturing contracts: how many units Sony have bought to be manufactured. There's certain volume a product line needs to make and Sony likely wanted to maximise the manufacture.
Second thing is, that how many units have been manufactured as spare parts or replacement units in case Sony needs to replace systems under warranty after the manufacturing have ended. A decade later accounting have made the writeoffs for the systems, no matter what happened to them.