I never thought I would say this, but I agree with Boneprone 100%
It is just like customer service in any other industry. If you go into a Macy's and don't buy anything, does that make you a freeloader?
How you are treated there determines if you are going to come back. I doubt most people say - "hey, I am going to go out today and buy me some porn."
They come to your site and find free stuff, the come back to your site if they like it. You have to remember, many people are very scared of hackers and the like. Many people are confused - you can be their guide...
Look at the Hun's site. It talks about a freaking teddy bear auction or something. I don't even know the story behind it, but is a guy that has a teddy bear auction gonna steer you wrong when you go for porn? NO!!
Why do you think the Hun takes sites without recips? Because he hates traffic? Because he doesn't need it? NO. Because he wants good stuff for his surfers and wants them to come back. They trust him. You think they are going to trust people that jerk them around?
How do you think The Hun got to 1,000,000 visitors a day? It sure the hell isn't his brilliant use of HTML (no offense if you read this). It is because it is simple, easy to use, and almost looks like a website written by a college professor.
Word of mouth, I remember when I first surfed for porn, where did I go - well I got jerked around a bunch, and then a friend told me about Persian Kitty. I always knew where to go from then on. There was enough there - that I never needed to go any place else.
Although, I didn't buy porn - I would have probably have bought from her. I didn't cost her that much in bandwidth.
It is your job to convince people that they need the "better porn" you can give them. Part of this is trust. Look at computer sites such as anadtech. He is like 16 (might be 17 now) and does well, because people trust him.
Look at Google - ever seen them advertise - they don't need to - their customers do it for them. Mark My Words, They will take over the Internet and in Two Years they will be the largest Internet company on earth with the possible exception of Amazon.
The best advertisement you can hope for is one from your customers. Treat people like you would want to be treated - they will come back - and buy from YOU.