I wouldn't even think about doing anything close to a porn site - I have no interest in showing more than I have already. My goals in life don't include being a porn star or a stripper. As much fun as I have taking pictures and having people enjoy them (and I do enjoy taking pictures!), it is not a defining factor in my life.
I've played with the idea of having a site because of OTHER goals I have, other things in my life. I wouldn't have a pay site just to show nudity.