actually they really arent...

cards from the 90s back never gain any value really... even Mantle RC cards, they stay the same unless someone comes along with a super high graded one like a PSA 9 or 10...

Jordan cards have gone up a bit but they even stalled... during Griffeys time, his cards shot up in price, especially the 89 Upper Deck, but then tanked as they all do... and have remained around 30 dollars (as i said, high grade ones can fetch a higher price, depending on population) for quite some time now....

newer cards on the other hand, can have some decent value to them, but they are mainly relic cards, auto cards, plate cards, numbered cards, ect... regular set cards arent worth much unless they are RC cards, and even then, arent all that valuable...

and they can lose value very quickly depending on the player...

i once bought a pack of Basketball cards and got a Darius Miles RC jersey card, beckett at the time listed it at 600 dollars, Don put it up on Ebay for me and i got 450 for it....

2 years later, it was worth 6 bucks....
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