I\'ve played a few games as a player and a Level Designer and one of my jobs was to upload peoples levels they created for their houses then add the house to the world, edit there house and collect the fee every month for them to keep that house or castle!
The game I did this on is called Graal but the houses were called PlayerHouses and there was one owner but multiple rooms with locks, beds treasury, banking system etc in each one! Then the owner would charge a monthly fee to however many people rented a room in that house depending on the size and luxury of the room! The smart owners could make a easy 100 gralat a month from chargin a few more gralats on each room! (This was done on the P2P server and the free ones, the p2p server made currency VERY valuable not like Diablo lol!)