This is a question I keep asking myself, yet still I find it hard to walk past one that is described as either not working or for spares/repairs.
They are just so much fun to work on!
https://i.imgur.com/BKuxLmx.jpg
https://i.imgur.com/6xSDJMa.jpg
https://i.imgur.com/VhdqB6P.jpg?1
https://i.imgur.com/ePwv7Ws.jpg?1