it wouldn't bother me. its only a car. if i saw an old car that was a bit of a wreck i would feel momentarily a bit sad for the new owner as i try to keep my cars in good working order and they didnt realise what they had. but it would only be a fleeting moment. if you've sold it then you have already made the subconscious decision to move on. i guess if you were forced to sell then its a bit annoying. if you've moved on because its old/broken/wanted newer etc then you've moved on.