Please feel free to correct me I am wrong, but as I see it ratios have very little meaning.
They are about as relevant as the number of people that walk past a shop.
If the number of paying clients stayed the same ratios would be effected by the number of websites. eg if there was one big tit pay-site with a ratio of 1:500 if another big tit website opened up the ratio would fall to 1:1000, but the number of people buying porn would be the same.
Add a hundred other factors, where the traffic is from, have old the people, how many have CC etc....
The are many things a pay-site can offer that a free site cannot.
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