because we love things that are greater. Faster, stronger, better: it's why we have and watch the Olympics. All that Superheroes are is the embodiment of that desire in a hightened sense. Instead of running a 10 second hundred meter dash, they run a 0.1 second hundred meter dash, and we fantasize about being these people and having that seperation of greatness. Many people want to be the best at something, and everyone has their talents. Some people, though, have talents that aren't awe-inspiring or impressive to the general community. One example is being the best computer programmer at a highschool. They'll probably get a high paying job with an important company and be an essential part of the company, but while in highschool, they are shunned as geeks and losers. That's why there are superheroes. They're loved, they're handsome/beautiful, they have perfect bodies and inhuman talents, and they usually get the beautiful girl. It's the very embodiment of many men's souls put in ink on paper, and it's great, but it doesn't maintain interest. Struggle, whether internal or external, creates interest, and these can't be ordinary people, because our Superheroes have to be better than that. They have to be geniuses, or rich, or also have super powers but with a general malicious intent; hence, the Super Villain. It must be the hero's equal, and in many cases nearly triumphs over our hero, but then some external force, some times embodied by ordinary people, change the current situation in some way allowing the hero to win. In this way, the comic book shows that normal people can make a difference as well, so that when reading the comic book you don't dispair afterwards because you know that you will never have that power.