I guess the evil fee was kind of a controlled mechanism after all. With it being levied on previously used IP address or addresses to which an account has been permanently banned before. It just shows how in control bitcointalkforum is. Quite unique and it seems fair.
But what could happen is that someone has a bot to probe different IPs until they find a "clean" one (without an evil fee), then register a bunch of "free" accounts on it and keep them until needed.
I guess the possibility of bots guessing IP addresses is were the problem lies. It's kind of like a mining trick but instead of mining coins, it's guessing IP addresses. It's really so uncool when a new prospective user happens to open an account and the evil fee comes up especially, when the user has still got a lot to learn on Bitcoin. Issues with hackers and besides, who buys a user ID anyway. It feels off.