If you were selling the card, would you rather sell it at 11K or 10001? That's why people do it. Like @TonyTheTiger2k16 said. Those people are looking to buy the card quickly at a price they're willing to spend that isn't quite the buy now price. Now, when the buy now price is 12K and someone puts up an order for 11K, that's just dumb...the margin isn't there now for someone to Sell Now to you. You're pretty much hoping someone either doesn't care about the margin or not gonna take the time to list it and just sell now to save time