They might not need so many daily necessities themselves, but they could always sell them to others!
Food was the hard currency of this world. The daily work at most settlements consisted of digging for food, and whatever they couldn't eat would be stored.
The smaller groups were like mobile department stores, constantly traveling to sell those daily necessities in exchange for food.
Tang Mo found these little department stores fascinating. They were incredibly well-stocked, not just with things the groups had dug up themselves, but also with goods they'd traded for at one settlement to sell at the next. This was how all sorts of new and interesting items were circulated.
Once established, most settlements wouldn't relocate easily. They would only shift their position slightly after they had completely exhausted the resources underground.
