This could be observation bias because the above-median listings are going to sit longer. So you scroll through, and that's what you see. The at-market or below-market listings will be quickly filled and removed. The same thing happens in the for-sale market too.

The same thing is true for order books for stocks. Anything that matches the buyer and seller at an agreeable price is fulfilled. The people selling too high or bidding too low sit on the order book longer.