Only business models that continue to stay profitable over time are the business that get a monopoly by the state, or go below the radar of potential competition
Paying for porn on the internet was doomed when the first people started to give it away for nothing, since then it has been a downward spiral, which will suck more and more potential business out of the market place at a faster and faster rate.
Now before you hang yourself over the idiocy builded into this business (counter wanking), then always remember that new opportunities arrives every day - there are millions to be made, but you have to find the road by yourself - copying what everyone is doing is pointless, unless you can do it better, which is kinda self-defeating, if its giving away free porn, and you want to make a business out of it...