I think it's a bad idea because of how difficult it already is to identify a photo if it is original, if it's a type 1,2,3 etc.
Thankfully the majority of people that sell photos at the moment are very knowledgeable and have hoarded many of them knowing they are very undervalued. So they have established good reputations.
If psa starts grading them you'll start seeing the big fakers come out to play.
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