Ah yes, Mr. Polkadots. I think we may have figured him out. eBay has a workaround that allows you to manipulate their sold history. If you list a $3000 Mac prototype as a buy it now item, after it sells you can change the title, description, photos, and price to something that is far cheaper, and it still shows the sold history. Meaning, you can manipulate the sold amount on a listing by constantly changing it around.
Not saying this is what Polkadots does for sure (it's purely speculation), but here's an example listing where it could be manipulated in this way:
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If you look, January 27, 2020, one is reported as selling for $36.99. Now, I've seen a lot of deals on things, but I can guarantee you that nobody who sells quantities of Mac stuff has sold a Mystic Color Classic for $36.99 in 2020.