How much would you sell a dressage horse for?

Ethan R asked:

My mother recently sold my dressage horse partner of 5 years. He was a Belgian Warmblood gelding trained to third level and ready to move to fourth. His father was Fraval, a very prominent sire. He was 17.1 and was a beautiful mover, top level quality for sure!! Years of professional training and was 9 years old. TOP LEVEL PROSPECT!