They were already purchased as “ extra” tix by ST holders in hope of financing a part of their overall purchase. However, many non -ST fans are waiting for the next round to spend their playoff $. That lower demand has led to lower prices, but of course sellers are still trying to recoup some of that money. Many are probably attending the game with their own tix, just selling the additional seats they bought as an investment. Before the opponent was known and date was set, lower bowl seats were listed on resale sites for $500.