To comment on an earlier ad, broken withers are actually not an issue. Once they are healed, they look rather weird, but the horse has no permanent issues other than having a bit of a difficult time fitting a saddle. Generally when withers are broken, it is just the top of the wings that get broken off, and given time off to heal, proper pain management, and care, most horses heal fine and can go back to doing whatever they were doing before they broke their withers. If it is recent though, then it is a big issue.
I once went to look at a horse, the ad stated that it was a Thoroughbred Arabian cross mare, who was I think they said 12 or something like that, great horse sweet personality ect. ect. ect. Well when we went out to look at the horse, it was most definately a purebred Arabian, no thoroughbred what so ever, at least 20, ribby and thin, there was NO tack in sight, just the halter and lead rope on the railing. They got on the horse and rode her bareback, all the while saying she was an awesome horse, fortunately we had my god sister with us who is an experienced horse person, so she hopped on, and then ask very nicely where the saddle and bridle were, so we could saddle her up, and the owner got a bit nervous, and said that they thought they had one in the garage, they'd have to dig around a bit, but that the horse does fine without one. We left after my god sister rode her, and she said that most likely the horse probably had issues with the saddle for whatever reason, and that it wasn't worth it trying to find out when the owners started getting evasive.