For the same reasons our old cars for sale are worthless and high dollar auction stuff is like gold, even though it's the same stuff.
What did the alphabetless, numberless stone go for? Is he attempting push starting it or just leaning on it?
It took a while, but I found a picture of the race car in action http://www.catamountstadium.com/what is in the background.htm
It would be neat for the new car owner to have that race photo. For awhile I stayed on line on a forum about the local race track. Some interesting photos and stories of days I remember going with male friends. Strangely I met a girl and only took her a few times to watch the races. Women ruin everything!