Thanks Scott, however, when I enter some of my cards and hit enter, it often comes up with a value of $0. Does this mean it has no value, or that it is so rare that it's tough to value, or something else (like maybe I am an idiot....!) For example, type in Cobb red portrait Piedmont 350-460, 42, in a 7 (I have BVG not SGC or PSA in this card) and it shows no estimate; it can't just be the BVG bc I have several SGC and PSA that do not register as well.
Also, upon what sources is the algorithm relying when it spits out a value?
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