On the topic of how much Khal will be sold for - you're all way below the mark! I work in showjumping, the price of the horses is insane. We had a 1.45 jumper who is less athletic, less careful and much harder to ride than Khal and he sold for 350k! Recently bought a tricky, quirky, known bolter with good breeding, has jumped up to 1.35s (8yo, so behind the mark in terms of age classes etc as he was too tricky to ride) and he was purchased for 195k.
Khal is worth an absolute fortune, not only because he is evidently a 1.45 horse that will keep going up the ranks, but he's relatively low mileage and produced by an amateur, easy to ride. Those are hard to come by!