2006-W 20th Anniversary Dcam Eagle

It seems everyone is buying up the Reverse Proof and the Uncirculated Eagle, isn't the 2006-W Proof low mintage also and if so, why do you think it commands a much lower price than the other 2 coins in the set?
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therefore total mintage is 800,000 + 250,000 = more than a million
one of the highest mintage year for the proof.