i know dressage i've done it before I don't understand why people do it if that's clearer and how old are you?
I think people that compete in dressage do it because its so challenging. It is the foundation to almost any equine sport out there (and if you are thinking "Nope not horse racing or polo" ... I totally think it all comes down to dressage). With dressage you learn rhythm, how to focus, relax, collection, and improve your movements and weak points. People that jump, and jump well, use all of these points in dressage. If you don't have rhythm, you get out of focus, can't collect, and basically your riding isn't going to get any prettier. Same for the other points, if you don't have collection, you can't focus your horse with what you are asking, you can't get into constant rhythm because your horse is not focused on you. These are only a few points in dressage.
All those people who compete in dressage I look up to. They are focused on what their horse is doing, and what they can do to improve and move to the next level. (As for those people that compete in dressage only to win... shame on you lol).
I'm 19 and currently in college... for what degree? I have no clue but I'm at least giving it a go haha.