Matthew McConaughey has paid BIG DOLLARS to have a couple of units custom restored. Other than that, they all depreciate. I just bought a loaded one year old Airstream (25ft Eddie Bauer) and saved a bundle!
I've also bought two others - new - and won't be doing that again. Buying a great lightly used unit requires that a lot of stars have to align. In my case it was a lemons to lemonade thing.
But I smile every time I think of getting solar, a Hensley hitch, etc., etc., etc., basically for free.
Really used - "restoration projects" are loved by some, and become money pits for others. Many times the person who starts the restoration sells it in mid stream to someone else with the energy time and money to finish it.
Happy trails whichever path you take.