They won't need a very big washing machine if the car gets taken out on day one and smashed up, not only that, they'd have to have insurance that covered rental. Insurance of a rental Lambo is going to be....big numbers. The insurance company aren't going to take cash. Even if you manage to pay for a Lambo cash in hand, which I doubt as the seller is instantly going to attract attention from the Inland revenue as soon as he deposits that money, which will trigger an investigation into the current owner of the vehicle. Sorry it's just too far fetched.