To encourage those to be out of their homes and within an area of society where majority of public are located....ruling the roost by forcing those to live harder.
After the neandrethal had found themselves out of the woods, by the luring of the nightly wolves under moonlight. The then change in life was to bring them out of their homes, too, thus the encouragement to pay their ways with money. Similar to finding themselves out of the woods, but to control the masses to be in a location of civilisation.