Did you go thru what the user goes to sign-up with a CC on the sites that you promote? Did you check the members area on all the sites that you promote?
I am somewhat ashamed but I have to say no for most of the sites that I promote... and as an affiliate you usually have to send sales before they give you access or sometimes they give you a time restricted access to the sites... probably to avoid the free loaders. And you need to harass them, anyways that is my experience when asking for members' area access.
I remember checking out one site's member area that I sent sales to... and it was like it was not updated in a couple of years... besides the exclusive content(movies and screen caps) the only thing there was shitty quality pictures as bonus.
I was kinda discouraged after that and did not send other sales there.