How often does someone ask you to sell your car to them?

When I used to take my Dart to car shows at least once a summer I would get someone who I could tell was completely clueless, walk up and say "Is this your car? Is it for sale? How many (look at badges, to see what kind of car it was)Dart convertibles did they make?" Would tell them that I wouldn't take any less than $10,000. They wuld kind of look at the car then at me and say "oh" and walk away.
At one car show a guy was telling me that he had a Dart convertible at home that he was working on, but his was a bench seat car, he seriously asked me if I would trade my bucket seats for his bench, told him "nope, I'm kinda using them right now."