Well as a business speaking you can bet they want your money, everyone wants your money, but it's specially annoying when they don't understand the tech properly. Anyway I agree that the millenials want to pay in Bitcoin specially porn related stuff which is more anonymous.
This still doesn't explain why it costs more to pay in Bitcoin than in traditional way when in reality it's cheaper for the operator of the site to accept Bitcoin than Credit card payments for example.
The only way I can explain this is an anonymity card that they are charging. Especially after what happened with Ashley Madison hack and their users.
Why does it cost more to pay in Bitcoin? Didn't they use current exchange rates on exchanges to determine the Bitcoin price for the services?
Like I already said above, this makes no sense at all. They must be charging more the fact that with Bitcoin you are quite anonymous. So they are pretty much just using the situation to ransom more money for themselves.
It's actually cheaper for them to use Bitcoin than traditional payment methods so this really makes no sense at all.