I would only compare this to other collectible cars that are today 4-5 times the value of what they were in 2005-2006. If I was thinking “bubble” I would worry more about those. Look at a few other special modern cars, Enzo prices are nuts too and I don't think there is any chance they will ever come down again. This is a function of the entire market dragging the Ford GT with it. I don't think the comparison between the Carrera GT and the Ford GT is relevant. No doubt the Carrera GT is a truly great car, but that doesn’t mean it will appreciate in the same way another car will. Look at the Lexus LFA, probably an even better engine and a car that in every magazine shoot out beat the 599GTO soundly. 599GTO’s still sell like hotcakes and LFA’s are sitting everywhere and you can hardly sell them at all. The retro mojo of the Ford GT is allowing it to be carried with the market more that some others. And, this is a “vintage” market, and the Ford GT is the only real modern vintage remake that has worked. It makes sense it will go with this market. There was an excellent large article on this market in Sports Car market Magazine this month. I think it was pretty obvious that the modern Heritage Ford GT was going to get a big boost when the vintage Gulf car sold for huge money a couple years ago. What's the price difference between a 1960’s GT40 and a 1960’s Gulf GT40?