Provenance increases the collectibility of items in every collectibles field, cards included. The proof is in the responses here: about half of the posters consider it a plus and presumably paid up to get it. It is akin to an autograph. Knowing that the person owned the item and presumably handled it adds a dimension to the story of the item. Judged on its merits, the Wagner is just another trimmed card in a PSA 8 holder, but add Gretzky-McNall, et al, and the story is a lot more compelling.
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