That looks like the RTR version, those are going for alittle over 1000 dollars brand new so 650 isn't to bad. The upgrades he's done are o.k., nothing tremendous, the question is, those 12 tanks of fuel he has put on the car, what kind of driving was he doing. Did he take it to a dirt lot a beat the hell out of it or was he just running ovals in a parking lot.