With automobiles as with most products as the price increases the improvements do not increase in the same proportion. In other words a BMW may be a better car than a car that costs half as much but it is probably not twice as good. By the same token a BMW is probably more than half as good as a car that costs twice as much.
Also keep in mind that the price range of BMWs can be rather wide with a heavily optioned 335 selling for close to twice as much as a base 328.
Drivers Club at Lime Rock
The Glen Club (Watkins Glen International)
International Motor Racing Research Center
Cayman Club Nor'Easters
Porsche Club of America
Madison Ave. Sports Car Driving and Chowder Society (Only a Vice President)
Sports Car Club of America
Polish Racing Drivers of America (PRDA)
American Mural Project
Simeone Foundation Automotive Museum
Mount Washington Observatory
Society of Automotive Historians