Baseball Cards Price

What determines the value of a baseball card?

I have the 1980 Topps set that has the Rickey Henderson rookie card. I looked on Ebay and the range for this particular card that was graded a 9.5 is $9.95 to $2000. Why the huge range for the same card with the same grade. There are two in particular that I'm confused about; both are graded by GAI, both have a 9.5 grade and yet one was sold for $482.77 and the other was sold for $2000. What's the difference between the cards? Links below. http://cgi.ebay.com/1980-80-TOPPS-RICKEY-HENDERSON-ROOKIE-RC-GEM-MT-GAI-9-5_W0QQitemZ230188796452QQihZ013QQcategoryZ106175QQssPageNameZWDVWQQrdZ1QQcmdZViewItem http://cgi.ebay.com/1980-TOPPS-RICKY-HENDERSON-RC-482-GAI-9-5-GEM-166_W0QQitemZ110189762527QQihZ001QQcategoryZ55869QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Public Comments

1. It's all timing. Someone might pay a premium if they want the card and at that exact time. We the consumer really set the market however like I said before timing and luck play a big role in a card selling for much higher than the book value(which we determine).
2. the Beckett magazine
3. usually it has to do with the player, age, condition, and how many of that specific card that are available.
4. sometimes it depends on the grading company. PSI is generally considered the best, followed by BEckett Grading.
5. Like anything else, the market, supply and demand.