egri hit it on the head as far as i am concerned, but also consider the volume of cards available unsigned vs the limited quantity available signed, with some cards being much more scarce (like the Agganis example).
Mantle signed a lot of stuff, but how many folks had him sign various vintage cards. Even fewer probably risked the mighty 52 Topps. Makes that card extremely expensive either way, but extremely rare signed.
I have always looked at it this way, if I am going to get a card signed, it's not going to be a reprint or a Pacific/Swell legends card, it is going to be the players best card I could afford.
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Looking for: Unique Steve Garvey items, select Dodgers Postcards & Team Issue photos
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