+1 just tell them to do it in /tr -_- otherwise ban. They can't get banned in /tr anyways, even if it's spam because I filed a /modreq once on someone who was literally constantly spamming the chat repeatedly (like 6 times every minute) with "please donate" and even though they received over 400k they still constantly asked and never even said thanks, haha. Anyways, they wouldn't ban because "it was in /tr for trade and wasn't considered spamming since it was in /tr" spamming is spamming. :/ just make them do it in /tr and turn it off if you don't wan to see it. Shouldn't be allowed in global though.
xD Summrs, "Please beg for meebles in /tr please"
~ @Summers
Oh crap. Dang, pretty much sums up what I said dad I read like the first comment and write it out haha
EDIT: just kick them with a note saying to stop or bet in /tr don't ban them. And if so, just ban for like 10 minutes.