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

Silver Eagle Proof Coins Ending Soon on eBay:
2007-W $1 Silver Eagle Modern Bullion Coin PCGS PR70 DCAM Deep Cameo Proof

US $94.99 (10 Bids) End Date: Monday May-21-2012 20:20:01 PDT Bid now | Add to watch list

• eBay Ending Soon:

  2011-W $1 Silver American Eagle NGC PF70 Ultra Cameo 25th Anniversary Proof coin $102.50 36m

  2012-W Proof American Silver Eagle $1 NGC PF70 PF-70 Ultra Cameo First Releases $109.00 28d 18h 45m

  2006-P 20TH ANNIVERSARY REVERSE PROOF SILVER EAGLE NGC PF69-BLACK LABEL BEAUTY! $217.50 23h 49m

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