I like the premise of your version and think places like this could exist, certainly just outside environments that lend themselves to crowd gathering.
I would like to see spaces
in the cities slightly more regulated though (Hey, you! No Loitering!) If you want to sell stuff you should have to rent the space or have someone who owns the space sell it for you on commision. This would prevent it from getting too huge and tons of players sitting around AFK at their individual little stalls making shopping a nightmare. But you could still do that outside of town if you want to, or maybe in the half-orcs slumy excuse for a town *ptu!* /jk some of my own guildies are half-orcs.
