This is how I thought it works but I'm not too educated on the topic, so correct me if I'm wrong: if you're creating comics and stories as a writer/artist for hire in a company such as DC or Marvel, the rights are theirs.
You get paid for your work and you're noted as a creator if you launch something new for them but the company owns that property.
If that's true, it's not to disimilar to being a designer or freelancer in any form: if I create a mascot or new logo for Coca-Cola as a designer, I get paid for my work and that's about it. There's no royalties or usage fees, even though the concept was mine. That's the way it has always gone.
So based on that, where's the fire?