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
International Motor Racing Research Center
Cayman Club Nor'Easters
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