Down the road from where I work there is a property that was a gas station/mini-mart that closed down. While the property sat unused, people informally began using it as a park-n-ride location.
Two brothers purchased the property and the first thing they did was to “erect” a full sheet of plywood that they painted (by shaky hand) a NO TESSPASSING (sic) sign that said violators would be towed and a phone number for the impound lot.
They towed a dozen or so cars before word got around. The fee was outrageous, but you paid or they kept your car with fees added daily.
I met one of the brothers and we were talking. I asked about the tow thing and he bragged that they got 50% of the collected fees.