That's one of the reasons I won't buy and sell horses. You never know what becomes of them. I'd love to earn some money in the horse business but other than selling them, I don't know what else I could do.
It's hard for me... I know horses are bought and sold into good homes all the time. Especially in this day and age where horses are the the pets and hobbies of people, not the work horses used as a tool until they are broken down. They still get broken down sometimes, but really, over the long life of a horse, their best job sometimes changes... and they might have more good homes than not. They start out life green and needing a person who is highly skilled, and they get older more experienced and would then be best for a beginner... and then later, they can teach children to ride but nothing harder. So what do we do? I would consider leases on mine.... but I can't ever cut ties... that is why I'll be reluctant to ever breed one.