My previous bike selling had a guy come over. He had motorcycle endorsement on his license. He said he was going to buy it, cash. When he 1st sat on the bike (while I was holding the key in my pocket) I took a pic of him sitting on the bike (hey let me get a pic of you on the bike). Also snapped a pic of his truck (assuming his) to include license plate.
Then as I was getting the key out of my pocket for him to start the bike he whipped out full cash and said sold, before even starting it. So I held the cash and he drove the bike just down the street and back, a very short test ride. Shut the bike off and called his girlfriend to have someone bring her to drive the truck off. All went well.
I had thought of consignment sale, and a local college for a small fee ($15 at the time) has weekend auto fair for cars, trucks, motorcycles, motor home's and boats. The college has a system where they show the vehicle/vessel then call the owner/seller for test drives. I had to fill in my information and a formatted paper about the vehicles (make, model, year, miles, engine etc. and things like mods, maintenance, any known defects etc.)
I had wondered about a motorcycle test driver driving off. I guess it happens. I figured I was taking a chance but was paid cash so fast before starting the bike seem crazy at the time.
My current bike (Harley) the guy gave me the key and said just bring it back in an hour or so. Didn't ask for any info, deposit etc. I did have my SUV parked in front of his house but I had the key. Well I got him down in price and then paid full cash.