Are you talking about a card that has already been graded? It's in a slab. The player can't sign it directly, although I have seen a couple people have the player sign the slab.
I think most people would consider that a curiosity and not pay extra for it. The reason it wouldn't decrease the value - you could always remove the autograph with one of the cleaners people use to get prices, stickers, etc. off slabs.
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Nick
Reap the whirlwind.
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Nick
Reap the whirlwind.
Need to buy something for the wife or girlfriend? Check out Vintage Designer Clothing.
<< <i>Does having a PSA graded card autographed increase it's value or decrease it? >>
Depends on the what the card is worth to start with before signing.