I would like to suggest that a filter be put on the submission of messages, at least on main chat, that would look for 'WTB', 'WTS', and/or 'WTT' in the message. If any of these are present and it is not trade chat, pop up a window to warn the user that they are not in trade chat and do they really want to do this.
I think this would really help the dumb people like me who keep sending messages to the wrong chat and make the guardians job easier, lord knows they have a hard enough job as it is keeping us straight.

Thank you for considering my suggestion