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For something that relies on physical delivery, you can do a lot more. And there are no chargebacks with bitcoins, so I'm surprised if there aren't lots of scammers. If you can convince someone to send you bitcoins, you have their money and they can't get it back.

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The reason there are not a lot of scammers is because the feedback / reputation system works.

I would assume it's not being spammed with false feedback at this time, either, which is rather helpful for that sort of thing.

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