I guessed griff just because I remember him saying, pretty much in passing, that he thought 'anon' was a bad idea.
I love the idea. I was, in fact, conjuring a short story that I thought of maybe posting as anon. It's great for personal issues. It's great for the "Who Am I?" game, which is probably ruined now due to trolling. If it's being used to, as you say, muddy the waters...or to agree with one's self over an issue... or to have an opinion on an issue that you need anonymity for solely because you don't have a balls to post your opinion on your own, that's another matter.