Car customisation is booming – but does it add any real value?

What could be more unique than your own fingerprint on the front hood. — Porsche AG/dpa

Michael Fux has pretty distinctive visions and desires, and as he became a billionaire selling mattresses, he could afford to indulge them.

He has a dozen sports cars and luxury vehicles, and most of them are specially tailored to his tastes, with colours you won’t find on any list of options for regular folk.