I don't mean to get any one on the defensive. I agree it is certainly none of my business if someone wants to park a $$$ RV, and let it age.
It just seems a shame to me, that it's not being used. An elderly couple on our street had a folding trailer in their yard. You could see the squirrels running in and out of it. The kids had to pay to have it hauled away, when the man died.
I know I have things that I keep 'just in case', but they're not that expensive, nor taking up valuable space, and not anything that my kids will have to worry about getting rid of, if something happens to me.