As far as aesthetics go, the Renovo TT bike prototype looks pretty amazing.

I wonder how the ride is. But honestly, the $4,600 Renovo road bike is in range of what many people pay for a carbon road bike with DA and nice wheels, so it doesn't seem out of reach to me. The Audi one's do seem marked up considerably over the Renovo's, not to mention the whole marketing package by Audi seems thin and full of snot. "Features no fenders and thin tires?" Ok...
(edit: and the more I look at it, the more I would love to ride it and see how it feels...if the ride is excellent, I can see a value in hardwood as a frame material. It looks like a beautiful guitar)