I don't think it would be that easy to hide. It would be easy to dragnet and find suspects by getting Amazon to report % of purchases by gift card by author, and then following up manually with a few customers should be enough to filter out any false positives and snare the scammers.
But what are you going to charge them with? Where is the evidence? The wrongdoing is hidden in the gift card purchases which you can't actually tie to the faker seller.
