lucy24 - 11:33 pm on Nov 3, 2012 (gmt 0)

back in the days when you couldn't sign up with what was obviously your business name or site name as your "nic" here

Funny you should say that, because at least half the posts that send me in search of a moderator have {name of brand-new user} == {name of linked site}. So that's where I'd put the block. Obviously you can get around it, but your average {malfeasant of any type} is no more intelligent than they need to be. Why make it easy for them? :)