I would say that most above ground pools are for quick assembly during the summertime. That being said, they should affect value about as much as a tent would. You can always just take it down when buyers are coming around. The whole point of an above-ground pool is that it's not a permanent fixture.
PAM I amde A Big Mistake, I am so sorry.. I sent an e-mail to firstname.lastname@example.org for the answer to your question. I am hoping to get an answer. I will give you an answer on Turlia when I get one. I have no idea how long it will tkaw, but I will keep trying. If you do nothear from me in a week- who knows how slow they may be to answer me, if at all. send me another question or e-mail me directly please.... more