As a TOTAL aside, I always think it is the funniest thing when people write this.... I mean, why don't they just NOT respond? It seems so childish to write this - like you have to have the last word. I always think it is better, when you are "done" with a thread, to just let it die quietly, rather than think you are being the tough guy and posting that you are "above" it. lol. It always make me laugh when I read things like this. Because, also, inevitably they come back and post AFTER saying they won't.
It is along the same line as the people who post "I am done with this thread" or "I am done with the board, I'm leaving". It's like they want people to come crying after them saying "Please! Don't go!" when in reality, they won't be missed.
Just an observation.