Currently I own Lumix 14mm, CV 25mm, 14-42X, and vintage primes. Yeap I sold a few bodies and kept kit lenses. I will transfer the registration only if asked ;)
Over the next few years I would replace all vintage lenses with modern MF lenses. Trading is new norm.
did you already register the camera to your account? If yes, you have to transfer the registration to the new owner in order to have a smooth transaction and a happy buyer...