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T206CollectorBut seriously, not all creases are alike. There are spider wrinkles, creases visible only from the back, card-breaking creases through the face, corner creases... all of them impact the value of a card differently. However, two SGC 30's will usually sell for about the same, as long as the imperfection is comparable in terms of detracting from the image and/or quality of a card.
The rule is basically that a card can't grade above an SGC 50 if it has a crease. And, if a card has a crease, it will usually grade SGC 40 or less. SGC 50's sometimes have a single minor corner crease or a mild crease that is only visible from the back.