7 – Floyd Mayweather’s Koenigsegg CCXR Trevita - $5 million
Not exactly the kind of chap to make a secret of his wealth, Floyd Mayweather hit the headlines when he bought the single most expensive production car ever sold. This kind of cash scooped him a stunning Koenigsegg CCXR Trevita with a thousand and one customisations, including one that makes the paint job sparkle like a million diamonds. And the fact that there are only two in existence doesn’t harm its value either!