Question for people with boat lifts

I am just asking out of curiousity. In recent weeks I went to a high volume Mastercraft dealer in an area known for small private community lakes or rivers that have a dam forming a small lake so to speak all with nice homes with lifts/docks. When my buddy was talking to the sales staff I was wandering the lot in the pre-owned boat area and noticed so many expensive top brand wakeboats that the back 1/3 of the boat (sunpad and back) were just destroyed by exposure to the elements (assuming the angle of lift in comparisson to exposure to the sun). These boats were anywhere from 3-6 years old, some with low hours. Some of the Mastercrafts had teak platforms that looked worse than old seasoned oak firewood. Is maintaining a boat on a lift/dock much harder? I know, I know...it's their money so who cares how they take care of their boat. However, for those that do not have trailers, or rarely use them, does it ever concern you that your boat is out all or almost all of the time?