I don't think there is a girl alive that, in her heart of hearts, doesn't want to be beautiful. You're not going to spend close to 30K (or more) to look "just plain & passable". You're spending all that money because you want to look beautiful.
I think some of the girls that say they just want to be passable already think they are beautiful so that part doesn't concern them as much. But I don't know of anyone who's only goal is to look "eh... so-so."