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Yeah. Amazon didn't start the answers section like this. Once Amazon started emailing random purchasers to answer questions about the item they purchased, the quality of the answers went way down.

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In principle it would be very easy to Amazon to detect 'I don't know' type answers.

In principle it would be very easy to Amazon to detect when a product listing is switched to a completely different item, yet that fraud is rampant.

Yes. I was already implicitly blaming Amazon for the low-quality reviews..

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