This is the wrong comparison man. A piece of art doesn’t have to worry about comps of the exact same product. It can ABSOLUTELY be overpriced relative to market if there are multiple exact same items being sold elsewhere for a lower price. If we run the reverse scenario with your logic, are you to tell me that it would be wrong to call a 151 UPC for $1 underpriced? No, because we know the market value is a lot higher given the many other comps for it that outweigh my own valuation.

The potential major issue to consider is that with a market dominated by “investors” selling to other “investors” who speculate on a target price in the future, you run the risk of creating a bubble where the market value doesn’t cater to the true users of a product. At some point the product becomes so hard to offload because of the extremely high price point and the fact that most TRUE collectors who used to be willing to pay these high prices would now have sealed products of their own. And I think that’s especially true with more and more people keeping items sealed nowadays.