Quite sure it was suggested, but walking through uruga even on good PC is difficult, fps drops by alot when you get close to vendors area. Same for eld.
Why not add npc which will be accessible from all towns and which will lead to small area meant for vendors?
That will decrease stress on other maps and people who just want to do quests.
P.S. : you can vendor in lucky house, but space there is rather limited by those npcs/slot machines.