Bentley GT Speed Convertible

At the Detroit Auto Show earlier this month, luxury was in the air. Pricey new Bentleys and Maseratis glittered - including a Maserati 2014 Quattroporte with a $132,000 price tag; U.S. Cabinet Secretaries and dignitaries rubbed shoulders; and many of the well-heeled attendees ponied up for a $300-a-ticket black-tie charity ball.

But in a city that is slowly dying, the glitz didn't extend much beyond the Cobo Center exhibition hall.