I simply believe post like that are designed to stir the pot, stroke the op, and ralley the troops. Its not a goodybye at all. Theres actually alot of good people on the Ks board even if they read more than they post.
While you may think he's stirring the pot, you kinda did the same with your post, just sayin'. I've seen many a rage quit on various forums over the years, and a simple "goodby" is pretty tame and not very drama-inducing, in my opinion.