Especially with that single-payer healthcare we have. The unit rates for things like Dr. hours or beds in hospitals are enormous. If we can cut down on the number of visits required because people have somewhere safe to live and aren't getting injured/sick living on the street, we could save huge amounts of money. Add onto that the cost of policing and/or incarcerating them, plus the economic benefit of having downtown areas feel safer for people, thus encouraging more people to live/work/spend time in those areas.