2001 S Sacagawea dollar question

I had a question about the 2001 S Sacagawea proof dollar. Does anyone know why this coin is rare and has such a high value compared to the rest of the Sacagawea dollars? Since this coin came out of a 2001 S proof set wouldn't that make it just as rare as any other 2001 S coin? Yet the rest of the 2001 S proofs are not worth near this one. Can anyone explain this? Thanks

 

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Well i looked in my coin book and there is no difference between that coin and the rest

 

Looks like the lowest mintage, but not by much.

 

See this thread: http://www.cointalk.org/showthread.php?t=37702

 

Question comes up fairly regularly. Answer is still the same, no good reason. Yes it has the lowest mintage but only by a tiny amount an the second rarest has no real premium. If another date such as the 2008 were discovered to have a very slightly lower mintage you would see the 2008 -S Sac jump in price and the 2001 S Sac plummet.