Quote:
Originally Posted by TanksAndSpartans
I don't think using a factor will work - I do that sometimes if say I just missed on a PSA 5 and then a PSA 6 comes up - I may multiply by 1.25 or something, but I think that only works for the section of data that is somewhat "linear". The PSA 10 cards are sometimes off the chart compared to the other grades - Rickey Henderson in baseball comes to mind.
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Good point, John. I guess in general I used this to extrapolate down, not up. My basic metric is a 5 is 1/2 of a 7, a 3 is 1/2 of a 5, a 1 is 10% of a 7. Above an 8 it sometimes gets crazy and comparing a player with a like player at the same grade is a better approach. Dealers often bid on cards up to 50/70% of their perceived value. I've noticed that bidding slows considerably thereafter as dealers can't make enough $$$ to continue bidding. There are exceptions, though, like hot cards that are rising fast.
The last idea is to ask other collectors! I often reach out to others to get their opinion about an item as they might have more expierence / knowledge about it than I do.
jeff