It does seem like one of the major questions is whether all this doctoring increased the value of the card, or whether the card would have been worth more if it remained in its original state.
I suspect the whole crux of the matter is financial incentives. If I can take a card that might otherwise sell for $25k, and turn it into $50k with $1k in restoration, even if the restoration is disclosed, known, and understood, then it seems like you're looking at some pretty serious incentives for a large swath of cards to suddenly move into the restoration phase, and open wide the floodgates for some now-honest profiteering from the hobby's card doctors/restoration groups. (Since it's disclosed, it's honest, natch).
Of course, this pricing dynamic may be unique to cardboard where the supply dramatically overwhelms demand, such as with the T206 Wagner, or the 311 Mantle. Would the same economics apply to a heretofore beat up and newly restored 1966T common, or even a 1966T from a major HOFer? Probably not, simply because I can probably get a very nice one (ostensibly that hasn't gone under the knife) for less than the cost of the restoration.
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Trying to wrap up my master mays set, with just a few left:
1968 American Oil left side
1971 Bazooka numbered complete panel
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