Black cameras take better photos than chrome ones. The chrome causes reflections that interfere with the 3D effect which then conflicts with the bokeh and detracts from The Film Look, especially when shooting with The Leica. Black also absorbs errant photons that can degrade micro-contrast and exaggerate chromatic absolution within the Circle of Confucius. And, lastly, black cameras exhibit superior Scheimpflug Principles -- mainly on the Plane of Spain, of course, where it counts the most.
Oh, and they're real chick magnets too.
But black cameras don't have that cool "retro look", whatever the hell that is.