While subjective, ultra-exclusive custom coachbuilt vehicles and hypercars command staggering valuations that many consider the most extreme in automotive history. Notable examples include the Rolls-Royce La Rose Noire Droptail and the Rolls-Royce Boat Tail, which carry bespoke price tags estimated around $30 million and $28 million USD respectively, alongside rare one-offs like the Bugatti La Voiture Noire valued near $18.9 million USD.