AnonymousAF15,
thank you for your story!
it actually validates to some extent, my theory that comics, coins and a few other collectible categories are functioning as alternatives to fine art as a hard asset investment.
It doesn't take very many new buyers to affect the demand curve & pricing as at any given time, only a % of the overall books are on the market.
I don't necessarily agree that the popularity of superheroes has peaked though, simply because, as you point out, there is potentially huge upside growth in foreign markets due to the huge popularity of American superhero films overseas (China and elsewhere)