General discussion board about VAMs, but no buy/sell offers
If I understand your question I believe you are referencing the Green Paramount Redfields. If so, they command such a massive premium because they are Redfields, obviously, but they are incredibly rare. They were ment to signify a very high grade gem coin. Remeber, this was a time before MS Sheldon grades were 1-point jumps. Not many were produced in the first place relative to Red & Black plus many were cracked out once the TPG game started coming into existence in the late 80s/90s.
Vampicker saying that he hasn't seen one in hand should be a massive clue as to their rarity. As for the non-Redfield Paramounts, I don't really track those so I cannot speak to it. I do know that they can and do command premiums but I'm not quite sure how much relative to coin/grade in a Big-3 holder.
Alonzi VW 2.0!