On some others forums I've participated in, in the past one site rule I found quite refreshing, was the prohibition of "goodbye threads". It worked like this...
The rule was laid out to all, that no "goodbye threads were permitted. And if someone so chose to post one anyway; the the moderation would ban that individual immediately for various amounts of time, depending on the particular site. Not only does this help such a poster avoid getting cold feet; this type of practice really helps a site stay focused on its intended topic, rather than getting cluttered up with post after post, and thread, after thread, of what amounts to nothing more than sad, attention seeking behavior.
What say y'all?
Experience has been that less of 1/2 of the "good-bye" threads actually lead to never seeing that poster again.

Many are back as soon as they get a load of the "rules" elsewhere.
If they have gripes -- as long as they don't discuss SPECIFIC PEOPLE or SPECIFIC moderation -- I see no harm.
Now -- if you're gonna completely melt down and create a spectacle -- Please do that in the Flame Zone -- not Announcements. Because it's much more enjoyable to participate in actual meltdowns in one of the Taunting Forums.

They CHERISH goodbye threads in there.
And many other forums don't have lightly moderated Taunting Areas like USMB does.
Flacc(Hi mate,Xmas Greetings to your Family and You) I was wondering after reading your statistics,of those who have been banned,what % do not return,just wondering,steve ps Flacc what member(feeling slightly uncomfortable here LOL) has had the most warnings....as for the others comment re-saying goodbye,some are Churlish indeed,others not, led by Chris the Eyes,
Looking from the outside in,for a while,I note some members have become quite shallow,actually brain DEAD and detest being the receiver of a Critique,I put it down to their New Leader Mien Trump,who SLAGGS OFF all and sundry,yet has the skin thickness of circa a micron himself<>Shamefully Crying to certain Media,saying they are picking on me,pathetic really because what he does know and lies about is,that most people DO NOT TRUST OR LIKE HIM,apart from those headless Lemmings(Incredibly some women!!!!!) who kiss the ground he walks on.
But you Mods have done a Greater Job this Year.steve