How much does it actually cost in real money to keep your Vault running? I have already spent $20 and have absolutely nothing to show for it. If I build on a room there are no new dwellers to assign to the expansion of the room. Those out exploring scavenge nothing worthwhile and die quickly. And, if they do manage to salvage something it takes sometimes hours for them to return to the vault. The fun of the game is wearing very, very thin.