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Toddwhile I don't disagree with your explanation as to various points on a demand curve, I believe the infusion of additional collectors, particularly on any meaningful level, shifts the entire demand curve to the right/upward, thereby increasing price. Also, it is possible that supply/demand analysis could be impacted by a Veblen effect, particularly this hobby 
I haven't had to use many of these concepts in conversation for thirty years, and would defer to those who do this for a living.