I'm thinking a lot of that 150k went into the engine and mechanicals. The car was built for the 2010 Power Tour. "Starting with a GM Performance Parts block bored and stroked to 485 cubic inches, the gang ordered up special heads, exhaust and cams, topped with a Bell supercharger that makes the unit good for at least 1,000 hp. " (from Jalopnik).
The distressed "look" is just paint work... nothing a good respray can't fix.