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 .
Auction house Bonhams sold Ringo Starr 's vintage car on December 1 . Classic cars rose 430 % in value over the past decade . Investing in classic cars bears risks such as maintenance costs and lack of liquidity .