I tested a few Tor circuits and discovered that a few do seem to use a end node server which is blocked by The Firing Line.
Have you considered using an advanced CAPTCHA to prohibit computerized registrations and brute-force login attempts? If not, a read-only blacklist is a little harsh in my opinion. Even the most extreme should be a blacklist of the login and registration functions of vBulletin.
Honestly, I could see the reason for some users here to want anonymity.
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