My voice is going hoarse all the time after writing just one line in trade chat. Type one line, try to say another one right* after (*say 3-5 seconds): hoarse. Not a fun way to communicate (people do converse in /trade as well) having to hold back for 30 seconds or whatever is the cool down for going hoarse after each line. This only seems to happen in /trade, not in local, /zone, or /g.
This is on purpose so you can't spam your trade and block other peoples offers, so you have to wait. Also, Trade channel isn't meant to converse, just trading. c;