You can basically tell if someone is safe or not. My Son hates it when anyone comes to the shop because he doesn't want people to know what all we have in there, so whenever I sell something on Ebay that has to be picked up he freaks.
I just sold my old arc welder and a guy came to pick it up and you could see he was just an average guy so I gave him the cooks tour, just like you did.

Plus we work with the shop garage door wide open, so it isn't like people who drive by can't see inside.

Don