Nice coins. I struggle with your valuations.
You're pricing the error coin at 6x face value?!? You realize that it's the most second common coin issued by Mike, right? Over 5,000 of these error coins remain funded (of a 6,000 mintage).
And the "tenth" coin is going for 15x face value? I guess I see your rationale for the higher valuation, because only 800 where minted, but 15x is way too much.
I look forward to seeing what these coins go for. My opinion is only my own but I believe the rationale on some of the offer prices for these coins are just insane and, worse, without logic. I think it's an important discussion for us all to have.
2011 error coins always command a large premium for a few reasons: they were the first coins, they had an error holograms, and most were handled when purchased. It is extremely hard to find a clean non handled 2011 error coin. Most of them have graded low and MS-66 is really nice (Look how clean that coin is). I can give you a break down of premiums if you like or you can search for past sales.