Hello, I sold my sons 2003 KX65 with lots of extras for $2100. It had Rethal bars, ASV levers, Flo green and black plastic, N-Style graphics, Doma pipe an silencer, frame guards, rad brace, and skid plate. Basically lots of stuff, plus a big box of extra stuff like cables, tubes, factory plastic, complete extra graphics kit. Just to give you an idea of what was there.
So a bone stock bike, I wouldn't think should sell for more than $1600-$1700 if it's perfect.
Mike S.