Seems to be quite a lot of issues with trades being conducted over main chat. Main chat defaults to show trade chat. I suggest that trade channel be excluded from main chat channel altogether and eliminate most of the trouble. It does get a little confusing when every channel is visible all the time. If someone wishes to have trade spam on their main chat they have the choice to add it and therefore the risk of gaining curse of silence if they forget what channel they are speaking on.

Just my 2 cents.