In England fans who placed multiple internet orders hoping they might get tickets for at least some games are now burdened with unwanted and possibly unsalable tickets.
Hotels have exacerbated the problem by being always on sale, by offering discount rates on discount rates, and by treating all inventory as distressed inventory.
At the retail or intermediary level, returns often come back due to slow-moving stock, end-of-season inventory adjustments, or as a means to release capital so customers can buy more from your firm.