I just tell them that after seeing how my last MB looked after my daughter totaled it 2 weeks after her 17th birthday last November ( and how really, really wrecked the car she hit was), the only car to replace that Benz was another one.
Then I tell them that for what I paid for my prestine drop dead gorgeous garnett red 1988 300CE with 41,000 miles on it I could have purchased say, a 1998 Chevy Impala with 65,000 miles or maybe a 1995 Ford Explorer with 90,000 miles on it.
Then, if their eyebrows are still bent out of shape, I tell them to read my license plate: " LYTINUP "
Anyway, as my late father used to say: "Illegitimi non carborundum"
Jim