The horror stories I hear about in this industry make me wonder why I chose it as my major/potential career. I would never do that to a student, not only is it unfair to the student- but it is extremely and unreasonably unfair to the horse.
Always call a vet. If you don't like what the vet tells you, and see the horse as a money pit- I'm sure there is a retirement home/sanctuary/charity/rescue that will take and place the animal free of charge.. or put it down.. or send it to auction.. Even the most unpleasant option in this case is probably better (for the horse) than sticking the horse on someone unsuspecting!
No offense meant to the OP.