I spent a couple winters doing sales for a local small used car dealership. We did not operate that way, we couldn't get away with it. Where we live its more like here are the keys drive it for a day and if you like you can pay for it when you bring it back tomorrow. But occasionally when a local guy was looking for something particular we would work deals with other dealerships in bigger towns to get what they wanted. Even in that scenario which was not handled the same way as a customer walking on the lot, but much more of a regular business transaction, they were almost unbearable to deal with.
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"If his brains were black powder he couldn't blow his own nose"
-From Stephen King's The Shining