Concept cars

MK1 TT

TT Concept car

VW W12

I think that concept cars are a great idea, allowing car companies to preview their new models and tech before they go on sale, and see what the public's reaction is, but I don't understand why some of the concept cars either A) never make it to production, or B) have very drastic changes before being made. Take the Audi TT for example, there was virtually no change between the concept version and the Mk1. This is a good thing, because it was a pretty car, whereas other pretty concept cars made it nowhere near production, like the VW W12, or the Alfa Fivorante. These cars should have made it into production, because they're pretty, and therefore would have sold thousands of units, and would make the companies millions. It makes no sense to me, but I'm not the boss of a multinational car brand. Oh well.

Alfa Fivorante