Board Thread:Midian Q&A/@comment-24302820-20150308084954/@comment-24302820-20160501223310

I thought about that, but living blood banks also mean that you need to bring in food for your guests. This means money is needed to sink into the system, and space is required for housing and storage of food. Unlike farm animals, these blood bags generally won't be providing for their support in the form of work and food produced. It's a partial solution, but not without its own kinks. A set up like Ran's is expensive to run, and was the single largest expenditure of his dominion.