PLEASE NOTE: No matter what the current trade rules say, article 1a overrules all!
Guards do not allocate market prices. Further, it is not in the task of any guard to do market research in order to find out current market prices for players. If a player wants to sell items, especially rare items, the research for the current average market price is in his own responsability.
If you have any issue to report, or any question and I am not available (afk or off) feel free to send me a letter via ingame mail or private message in forum. Your issue then will be answered after my return. Thank you!