>>149253579
pic related, variant covers for a single issue of Batman (you have to buy them all)

In short, comics were only ever valuable precisely because they were not valued at all. This led to them being rare therefore valuable. But now everyone and their grandma are carefully slabbing and preserving absolutely every comic, and the companies are pushing for it.
They will never be valuable, perhaps in 300 years when the paper has rotted and the only comics that survive and ones kept in climate controlled vaults, they will be valuable.

300 years to make a profit of perhaps $20