Ability to find buyers immediately after uploading
When “collector A” uploads/adds a card to their collection. if it is something that “collector B” will buy then “Collector A” has the ability to contact “collector B” about their offer. Collector B would have to update “hot sheet” with must haves, and willing to pay labels for each card, or they would be responsible to pay the amount they last updated for said card. Of course the site would take a percentage of the sale for facilitating this transaction easily.
Talk about increasing sales volume... I hear the million dollar idea right here