You say that like it's a bad thing. I've come to the conclusion that most of what most people do is at least in part related to vanity. Why does anybody care how they look at all? E.g. hair style, fashionable clothes, "accessories"... why do people go to the gym to "work out" or ride their bikes for "fitness"? These are all at least in part to look good, and to feel good. So what?