Since Techweenie sort of sequed to sociological evidence for dirt-bagness (okay I made the leap), there was a recent UCBerkeley study on the behavior of those with and without wealth, in both real and in role-playing experiments.
Exploring the Psychology of Wealth, 'Pernicious' Effects of Economic Inequality
One of the 7 studies was to observe the brands of vehicles that would yield to pedestrians waiting at a crosswalk. You might hazard a guess as to the types of cars that blew past the potential street crosser.
It might be interesting to actually calculate, based on this random and anecdotal thread, the percentage of high end vehicles pictured in douchbag parking lot poses.
The exceptions, of course, are those owners who post on this thread.
Sherwood