I would say it's wrong because it's free advertising to the seller/consigner, and that being the case you would be taking food off Leon's table or from his dogs and that's not good.
Also I think it would skew the market the same way if no one saw it as you may have people firing away just because they want a rare piece that they normally wouldn't have seen. So you can't call that true "market" value.
Plus the the idea getting a rare card that not many knew about is why we search eBay for hours and hours looking for that type of find.
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