And the main reason that a select few are "worth" astronomical prices relative to all the rest is because of insane demand. That though should make comic "investors" nervous, very nervous. You see unlike supply, demand is fickle and subject to the vagaries of fashion.
Now I know why I love my comics and other collectibles. It's a combination of nostalgia and my own personal aesthetics which are to a certain extent a product of my life experiences. Since these two factors are largely a function of my age, they're shared to a large degree by whoever else was born in the United States, Canada and the United Kingdom at roughly the same time. But I won't last forever. And when I'm gone the nostalgia aspect of my demand will disappear and there's no guaranty many other people will continue to share my aesthetic preferences. So what will happen to the demand for the comics and other collectibles that I love so much? A sobering thought indeed for those younger than me.