Self- service car mart

Do anybody know about a self-service car mart or you can call it a Used Car Flea Market. The concept is A person would rent a vacant lot that is not being used for a weekend period and advertise to get buyers and sellers together. Charging the seller $25.00 a day to have his car displayed for potencial buyers. All transactions are done between the seller and buyer. I am interested in doing something like this but want more solid info. thanks in advance-Rhonda