Yep. And they can stab you in your own driveway and leave you for dead..... then your wife can sue the knife manufacturer for making the knife, and start a political movement to outlaw steak knives.
Anyone who lets unknown persons on thier property to assess a for sale item is looking for problems.
I would made available to the seller, photos-descriptions-info, when it came time to see the vehicle and potentially exchange money, we would meet at a fire station, police office parking lot,,
That provides protection for both parties.
When I buy-sell local to someone that I met through a forum like FABO, I research thier posting history, if it looks fine, then no problem, we can meet at my place or theirs. But never with an unknown person.