Because comics amount to being either formats of books or forms of popular culture - which one chooses specifically to become a fan of, in order to be underlining one's particular or belonging traits, completely to preferance in due time. Or one would prove to simply being too touchy about oneself.
As any people will mostly like how others might be liking or not liking what people'd happen to be feeling to like. People wanna fit in both as be to stand out, all at the same time.
People like that game - at least most of the time.
Thanks to comics, I know that neither way bloated heads or mullety hairstyles (or any glow-in-the-dark variants) can really be to serve a purpose.