What else would you reasonably use to value a card? If I'm looking at card X in Y condition and I see it's sold in similar grade 7 times over the last few months, using those 7 sales gives me a good idea of it's current value to discuss price.
Sure, the market can change, and no, one shouldn't use sales from long ago, and yes, using a single BIN can give a misleading value, but if a card sold publicly and recently for Z it's generally worth about Z. Especially when it's a more common item with numerous sales.
What else would you use to value a card if you completely ignore other sales and its sale history?
|