I agree, going after the host is fruitless. I did that and they had to move about 6 times. Always found a new home.
However with billing what I would do is register and then send the admin a pm telling him you want to join with say Amazon. At some point he will have to give you his Amazon email address (or whatever is used). You then go to Amazon and say "this person is using Amazon to sell stolen content - Please shut him down."
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