I really don't know where the high numbers come from...maybe some don't do their own wrenching or really drive the hell out of the car.
I've had mine for 4 years and have maybe spent a total of $1500-$1800 over that time (not every year). Half of that is probably optional mods. It's worth mentioning that I do all of my own work. Tires are expensive and expect to replace those every 15k-30k. Other than that...
BTW, she needs tires, brakes, and possibly a water pump, so that number is about to go up $600-$1000