List of most expensive cars ever sold:
1931 Bugatti Royale Kellner Coupe : $8,700,000
1929 Mercedes-Benz 38/250 SSK : $7,443,070
1931 BugattiRoyale Berline De Voyager : $6,500,000
1962 Ferrari 330 TRI/LM Testa Rossa : $6,490,000
1966 Ferrari 330 P3 : $5,616,000
1962 Ferrari 250 GTO : $5,500,000
1930 Bentley Speed Six : $5,109,700
1935 Duesenberg SJ Speedster : $4,455,000
1937 Alfa-Romeo 8C-2900 : $4,072,000
1956 Ferrari 410 Sport : $3,822,500
As u can see, Ferraris and Bugattis are worth their weight in gold
AFTER they're out of production. 
