the answer is of course, it depends.
There will always be a premium for signatures that are of a better quality. The price difference between the good vs bad signature is what changes with volume and what item is signed.
For a player where there are truckloads of examples, the nicer the sig, the higher the price. As the number of examples drops the importance of the quality drops, but there is always some bonus.
Additionally the specific player and item signed also factor in as a rare baseball card might drawn a premium from set collectors regardless of the sig quality.
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