One of my friends had an old camper for sale. She had it parked in her side yard with a For Sale sign on it, but hadn't listed it anywhere. One day a young woman with a child knocked on her door, gave her a sob story about being homeless, and asked the price. It was $3,000. The girl cried and said she only had $1200 and would Friend take that? Friend was going to say no, but started feeling bad for her (as intended). The girl went back to the car and brought her "husband" who she claimed just got out of the service. They painfully counted out $1500 and asked again if Friend would accept it. Friend caved. A week later she saw a camper that looked just like hers on FB marketplace. The interior shots even had the same pictures she had had hanging! They were selling it for -- guess what? -- $3,000! A couple weeks after that, she saw it again on FB, this time being offered by a dealer -- for $4500!