Mike,
I would have to say it is all over the board. It depends upon the card, the desirability of the player & auto, the scarcity of the card itself as well as a number of other factors.
For instance, I have an Houtteman '53 Glendale Meats card (the key card in the set) that happens to be autographed. I am not really an autograph collector - and the autograph is PSA/DNA certified. The card is not graded. I have never seen another autographed Houtteman Glendale Meats card so it must be scarce - but I actually prefer it without the autograph.
More common cards I think you will find the opposite to be true.
Z
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