I don't see any problem with what went down on ebay. Someone got the card re-graded, and someone was dumb enough to pay 3K+ for a 73 art shell.
Sure, PSA shouldn't have graded that card a 10. But still... as far as I see it, this is the buyer's problem. Gotta be smarter than that.
I don't think there is anything unethical or dishonest about probstein re-auctioning the card after it was regraded.
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