For what it is worth ( and that is probably nothing):
The weighting of "rarity" is done as we know by PSA , and only by their standards of weighting whatever that may be, because in my opinion and as we all know there are errors in their weighting scores. What is known is that a Babe Ruth ,for example, carries with it a weight of 10 for the set registry no matter whether the signature is on a GPC, 3X5, photo, ball, etc. Now then the autograph grade is a separate issue, and has no bearing on set registry total...that is solely dependent upon only having the item. The value of the item is mainly based on the autograph grade from PSA, medium, etc...
This is where PSA can get you if you are a collector by charging to grade the autograph and also put it in the set registry for comparison to other collections similar to yours.
Personally I do not care to have my set registered , it is no big deal to me. I would rather save the money to buy another item.
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