Have to say I just don't get their logic at all.
Skorts (skirts with ball shorts underneath) already exist and are widely worn by tennis players, so it's not like they're trying to market a new concept. I have some myself, and do actually find that they give a better range of movement than shorts (which I also have).
Skorts/shorts are equally revealing so if they are trying to appeal to Badminton pervs, I don't think skirts are going to make a difference.