One thing to remember is that comps are yesterdays prices, what it brought prior, not what it is in todays market. A rare or even scarce/popular card will theoretically keep moving in an upward trend, so there is no reason for one to assume it will bring the same or less, if demand is the same or higher.
I doubt any dealer is going to buy a card as above and price it for what he paid for it(comp price), they will seek a higher price level and set the new price level going forward.
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