I've got 2 neighbors that have houses, one has 6, the other has 8. Been doing it for years. Both owned the land they built the houses on.
It's lifestyle, it's what you do everyday you have birds. They both do it mostly with 2 people except chicken wrangling day. Only free time is between batches and gotta do maintenance when houses are empty.
You're married to the company supplying the chics. They can be demanding and can make or break you. There's only 1 game in town in this area. They require costly house upgrades regularly and they aren't negotiable. Their way or highway. Both have been successful and made a good living but it sure as hell ain't hobby farming