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Personally if you can get it for less than $300 and the provenance is impeccable, I'd go for it. Otherwise, avoid.
FB Marketplace is flooded with copies like this - nowhere near as rare or desirable as Rowling-signed/holo'd copies. I don't personally see the market in them. IMO the only reason they've been propped up for as long as they have is because of the trading card market putting inflated prices on some of the signers.