I'm not a "techie," so while I do know what an anonymizer proxy is, I do not understand how posting from one could possibly be banned, unless the anonymizer proxy has an identifiable IP?

As to credit cards, isn't that just a big administrative headache for what is a relatively minor problem (trolling)?

I think we all mostly behave ourselves relative to other IBB's, and even the anonymizer proxy postings are fairly polite in their own way... kind of funny, if you think about it...