Ideally, I would think you want to sell cards when people have a monetary windfall, when they have some additional discretionary funds. Since a large portion of the population bets on NFL football games they know the results of the majority of their their wagers by 7:30 pm on Sunday. I would think that a number of card collectors would also be inclined to wager on football games. As a result you list your cards with auctions that expire around 8pm on Sunday's sept thru dec to capture as much of that winnings as possible.
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