It's a good time to be in the luxury car business. In Volkswagen Group's financial report for the 2013 fiscal year, it is revealed that that Porsche enjoyed an operating margin of 18 percent. That means the Stuttgart brand made on average about $23,200 per car sold, according to BusinessWeek. Bentley wasn't far behind, and Audi (which was combined with Lamborghini) posted a 10.1 percent margin. This compares to only around 2.9 percent for the Volkswagen brand.