StuckIn1995
Suggestion:
Safe trading system that is used in many older MMORPGs. Provides safe method for players to trade / sell items while logged in to the game.
Player stalls that you can open / set prices on items and stand in town showing off your best gear / townie items.
Please see screenshot for example. In the mock up / idea I proposed it as a noble citizen feature and purchasable deployment from the Sovereign Shop as a premium item. But doesn't have to be - it could be a free item with a cool down or purchasable after prestiging, don't get hung up on that.
For large or quick sales, MM's could still be relevant for people who want to skip the 10% gold sink penalty. I think its a nice option with pro's and con's to balance trading.
ie: I have a GHelm worth 150MIL - I may want to use SLord to avoid the 15mil inflation tax through a stall. But if I want to be 100% sure I can trade an item safely or conveniently I can do it through a stall but 10% of my proceeds will be taxed.

Thanks for looking.
Edit/update 12/14/2020
Thanks for the positive feedback - since some folks seem to be enjoying the concept I threw together some examples of how this system could further add flavor to the game. These could be expanded to provide a few types of stalls including rare drop stall cosmetics. Think of these as the "mounts" of Realm. Obviously this is just to give an idea of what potentially could be done - not a finished product or balanced.
*** Keep in mind again any prices mentioned are completely just fluff/brainstorming.
