When I design and wonder what the point is I think of someone having a bad time in their life. Maybe they are sad and they wake up and put on something I have made and it makes them feel just a bit better. So in that sense fashion is a little help in the life of a person. But only a little.
I think how pay gets determined is pretty broad - experience how people look what they bring to the job. But there's no question women are paid less. Women don't ask.