1990 Civic Wagon RT 4wd..blown transmission

And I sold a car that books for 1400 for 8500… His car is stock old as fuck and has a blown transmission. The point of me posting all of this is just that toughdb made a decent offer and im just curious why he didnt take it… No counter offer or anything… He said best offer which means he WAS negotiable, what? What he was take $20 off? Im sure he would raise his offer $25 if that would sell the car. Just seems like he doesnt really want to sell the car.