I would expect to pay no more than 3-5 bucks for anyone but the very best players. I don't know what Ripken or Jeter might sell for, but I don't think I paid much more than $5-8 delivered for any I won. Their large size detracts from their collectability, as most oversized items have passed by collectors with little fanfare. They crease easy too, when shipped, if not well protected.
They make a nice novelty item for player collectors, but otherwise are just one of many failed oddball ventures. The lack of consistency is what bugs me the most. Topps insert cards, early 80s Fleer cards, UD cards, etc. All the cards are different and are mainly junk cards.