Someone got $6,600 for a sub 1000 mile '78 550K wearing its original tires, which is WAY more than I would ever have guessed. In 2011 When I bought my '77 550k with 7,700 miles on it and the original tires I paid $700. Later that year when I sold it with a couple thousand more miles on it I couldn't get more than $1,300 and it looked like it had just rolled off the showroom floor and ran like new.