As a current seller, who has seen 4 properties withdraw in my neighborhood in the past 3 days, I have an educated guess. Realtor agreements usually called “Exclusive right to sell”, are generally signed for 90 days. If your house doesn’t sell you may renew it for 90 days. So if you put your house on the market on Feb 1 with a 90 day agreement, renewed it 90 days later on May 1 , renewed it AGAIN on August 1, it has just expired. Now you are depressed, tired of keeping your home clean, and see little hope of it selling over the winter. If you can, at all, you just give up and let your agreement expire. I know I would if I could.