I would say 3k is fair for that bike. You will never get anything more the way it looks now. Trust me. Ive bought bikes 2 to 3 years old for 4500 so dont listen to dover...
if i were you Id leave it as is, cus you never know you may wanna ride it on the street too on some twisities. I would get a nice set of adjustable rearsets, good set of levers and call it aday.