The house next to me was on the market for three years. After endless bank bullcrap, they accepted our offer to buy it. In the three years, several people arrived to introduce themselves as our new neighbors who were renting the house. They all fell for $600 first and last with a signed lease with a minister who had to go abroad for missionary work. They all overnighted him a money order and he never sent any keys back. If I recall, it was about six times.
If you are not residing in a home for sale, do not list it with a sign in the yard.