Auction house Bonhams sold Ringo Starr 's vintage car on July 1 . Classic cars increased 30 % in value over the past decade . Over the past decade the average value of classic cars has risen by 430 % , according to Knight Frank 's Luxury Investment Index . Trading in classic cars bears risks such as maintenance costs and lack of insurance .
Auction house Bonhams sold Ringo Starr 's vintage car on July 1 . Classic cars increased 30 % in value over the past decade . Trading in classic cars bears risks such as maintenance costs and lack of insurance .