One reason to pay over market value, is once you buy these coins from the US Government, the sale legitimizes your ownership of it.
That is, whatever happens in the future between Bitcoins and the Gov/Fed/Treasury, your lot might have a standing in a court of law that other lots might not.
This sale basically cleans these coins from all previous illegitimate and/or illegal transactions that they went through - whether some of these where stolen, used to buy drugs, not reported or accounted for correctly with the IRS, etc.
In a way you are getting a government issued certificate of legitimacy. And you will not have to prove anything - when others will have to prove how they acquired theirs.
That is, whatever happens in the future between Bitcoins and the Gov/Fed/Treasury, your lot might have a standing in a court of law that other lots might not.
This sale basically cleans these coins from all previous illegitimate and/or illegal transactions that they went through - whether some of these where stolen, used to buy drugs, not reported or accounted for correctly with the IRS, etc.
In a way you are getting a government issued certificate of legitimacy. And you will not have to prove anything - when others will have to prove how they acquired theirs.