Why would you even pay for porn? I mean seriously... This... Is... The... Internet.........
People do pay for it still, as long as people pay for it, there will be sellers. Some people want more interaction and are willing to pay for it.
So there is definitely a market for this, especially for the fact that transactions can't be reversed, which is a problem with the porn industry.
"Hey Honey, why is there a charge on our credit card from COMEBANGMENOW.COM? Did you buy porn?"
"Why... no honey I didn't..."
Chargeback city.