I have calculated that at $2 per dozen, I will break even on my 8 hens, coop, feed and other supplies in about 14 years, not including replacement hens. It's not about the money, although it could be. For now, I am having fun and learning. If economic conditions deteriorated to where I would need to subsist on chickens and eggs, I will have knowledge to do so and I am sure I can do it for much, much less than it is costing me now.
PS. I agree with the no vet care. Come on. They're great! They're wonderful! But...they're chickens. I will always take care of them the best I can, including treatment to the best of my home-grown ability. Beyond that, they go to the great free range in the sky. So far, that hasn't happened. Farm life is tough, even city farm life.