I've always found it odd to compare restoration in the fine art world to restoration of baseball cards. The two are incomprable. A one of a kind painting being restored and preserved is not even remotely similar to a mass produced baseball card where the market places a value difference between cards of different conditions. It's literally the condition that gives the card its value, relative to other copies of the same card. So no, it's nothing like restoring a one of a kind painting.
The better analogy would be the ephemera market. A movie poster, or advertisement that was mass produced. Altering and restoring those things will decrease the value compared to a similarly conditioned untouched copy. Or if you insist on fine art, a statue cast from a mold, where hundreds of copies exist. If Remington's famous Broncho Buster statue had the cowboy's arm broken off and glued back on, take a guess of it's value compared to an unrestored version.
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