My guild has the same basic rule. We have that not as a matter of reputation, but the fact that most folks in the guild are relaxed nice people. We see no reason to tolerate an ass hat in the mix.

Not long ago, I gkicked a guy for breaking that basic rule. He decided to take his issues to trade chat, and started bad mouthing my guild. I was surprised and more than a little shocked to find people who had pugged with us, traded with us, and in a few cases total strangers speaking out on behalf of our guild. Seems like we have built a reputation, intentional or not.

Just when it seems like you are ready to go postal due to all the thunderfury, anal, and trollish chat in trade, people do something like this.

I this gets a little closer to it. Besides the question of whether it matters or not, if it's your guild, it's your guild. If you make a rule that everyone has to speak in rhyme or be /gkicked, then that's the rule. If the rule is "don't be an asshat", then that's the rule. If your rule is, "We do not tolerate malicious, hurtful behavior or speech...", then yes, screwing another player out of 2,500 gold is grounds for a /gkick.