Ahoy thar matey ... Your concept of a city of barbarians is a good one, but however any plans of plundering will have to take a back seat.
Using the warfare system is the only way now to break into shops, stores etc ...
Sure the lone barbarian thief could mug a hapless passer by, but the real booty, that held within \"safe' locations can only be assailed by a legion of troops.
Basha the Brainless Boozing Barbarian
For Beer, Bloodlust, and Busty Blonde Barmaids
Written by my hand on the 15th of Agamnion, in the year 977.