With that system, you don't even know that the unpaid item was taken by an ad respondent. Thanks for testing and reporting on that method. I used to live where farm-gate produce stands were common. There was always some shrinkage, but not enough to pay for an attendant, just as the deer always got some, because a perfect fence was too costly.
I knew a young woman who often walked through a rough neighborhood around 2 AM. She'd watch out for the first guy who looked vaguely threatening, and ask him to walk her home. They all became perfect gentlemen.
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