Lets look at my Dad. He has 24 airplanes that are ready to fly at any time. That means at least 24 engines. Well 22 engines and 2 motors. He has several others because, as an examlpe, he doesn't have an airplane for 45 right now but there is always the possiblity. Same with his three hundred twin. The airplane was destroyed but as he has had two there is always a chance he might build another. He got it when it sold for half of what it sells for now. Just because one doesn't have a use for an engine right now doesn't mean one should get rid of it. Also collectors never have enough engines.