I think it's true, in many cases, that these guys are trolling for suckers. Certainly, here in the LA area there are a number of dealers who regularly price cars in the range of 1.5 to 2 times the going price. Out here in Lotusland we have a goodly supply of people with far too much money and too little sense. Like, for example, entertainment industry types who want a cool car to show off in, and figure that you get one simply by going to a dealer and plunking down some cash. Duh.
Still, when asking prices get up to 5-10 times the going rate, the only explanation is utter carelessness in pricing. Even a cynic looking for a sucker wouldn't waste time trying to make that work.