First of all there are those here who do know who either AJK our I are. (Not sure if any know both of us) Anyone who knows me knows that this is me right away.
Secondly, there is a level of reputation that people have with their anonymous username. I have a reputation here, you do, CBC does, and others do. When someone isn't even ready to risk that reputation it is very telling.
It is very obvious from your posts why you are keeping this anonymous.
Some people are completely anonymous on DDF (I'm not but I do prefer my privacy), does that discredit their posts?
Sometimes people that are semi-anonymous want to have that fully anonymous privilege for certain conversations, its actually very common and accepted on many forums for users to have "throwaways".
There are times when a poster can't post a valid point about a certain topic because other users have preconceived opinions about the poster, and discredit anything they say. It is liberating for such a poster to post anonymously, this way their post can be judged at face value and not based on the popularity of the person posting it.
Unfortunately AJK and others get carried away by the fact that someone posted anonymously (call 911!! Someone posted anonymously on the internet!!) and attack the person instead of what they say. And unfortunately, AJK's reputation on this forum is convincing people to side with him even though he sounds absolutely ridiculous in this thread (seriously, find me one post of his that's on topic and is not involved in ad hominem attacks), while ironically calling posters hypocritical for not signing their name on every post.