Why are the 2008 American Eagle Silver Proof coins selling for more than the older ones?

Silver Eagle Proof Coins Ending Soon on eBay:
2012 AMERICAN EAGLE - 1 OZ. SILVER - PROOF - READY TO SHIP!!

US $74.95 (0 Bid) End Date: Saturday May-19-2012 4:45:07 PDT Buy It Now for only: US $89.95 Bid now | Buy it now | Add to watch list

• eBay Ending Soon:

  2012-W PROOF AMERICAN SILVER EAGLE NGC PF70 UC "Early Releases" PF-70 E.R. $129.95 27d 22h 11m

  2006 P NGC PF70 20TH REVERSE PROOF AMERICAN SILVER EAGLE COIN $408.00 18h 30m

  2006-P NGC 20TH ANNIV. REVERSE PROOF 69 SILVER EAGLE BEAUTIFUL SPECIMEN $214.62 16h 45m

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