There's been so many dupes lately, it'd be worth pinning somewhere.
It is pinned somewhere. Right there in the notice they get that tells them they can't ask questions.
They get this nice link: http://goo.gl/C1Kwu
Which links to this nice answer: http://meta.stackexchange.com/a/86998
On this nice FAQ question: What can I do when getting "We are no longer accepting questions/answers from this account"?
Most just don't care to read, and think that by coming here and asking a question we can magically lift this ban so they don't have to read or really do anything to fix the problem themselves.