Rob, each card in a set receives a weight. The theory is a card that is super rare with a low population gets a higher weight than a card that is not so rare. If a collector on the registry has the highest graded card he gets additional points. You have your weighted score which is the grade of the card x the weight. Simple math. Then you get bonus points for having the highest graded card. Collectors into the registry with a lot of money strive to find the highest graded cards. Make sense?
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