I think a vehicle with rust at the price you want is hard to shift!
Sure the vehicle is exclusive but the original drivers were never "carefull enthusiasts" that say series 1 or 2 GTS owners are/were.
As far as 15K I believe a mint GTS2 would only ever pull that kind of figure.
Hey, only my opinion if the right figure got put on this vehicle I may purchase but not above the 10K