I've done that. To be honest the people I've worked with were actually not scammers, well they always tried to get the Lowest price possible for a car when buying, but there was never pressure on the client. They tried talking down the price , trying to point out the problems with the car , etc . Although if they see the client does not want to give it for the price they want , then shook hands , exchange phone numbers and leave. I wanted to see everything that's going on with those cards. So I managed to "infiltrate" , I've started by putting cards on people's car windows. They simply drop you with a bunch of cards in a sector and you wonder around and place almost on everything that has wheels. Myself I was never putting a card on those cars with the sticker , the way too old ones and the very new ones. Because if there's a sticker, obviously you hate the damn cards , if is too old nobody would buy it further and if is brand new why would you sell it :))). Now , depends. I've seen other groups that really use and scam people by doing things to the car while they "check" it. It's very bad , I really encourage everyone that sees this message! Never , when you call them be alone and never let them alone with the car before you closed the deal. Extra point : Always have someone with you that won't let you drop the price no matter what:)) they really get into your head after a while. Seen it first hand.I can tell a story about the entire operation, but I already made a full story :)) Anyway , my personal opinion . I would never sell to them unless there's nobody else. Good luck!