It seems like having a full time professional barn manager run everything for a barn owner is not a financially feasible way to run a boarding business these days… if the barn owner is the one who wants to have the business.
It seems like the more viable model for barn owners who are not actually interested in running their own operations is to lease their facility out to a professional who has their own llc. The professional can then take on the challenge of filling the barn with clients, and managing the related boarding, training and lessons. The challenge of labor costs is frequently addressed by finding one or two young people who are interested in being working students, and looking for housing, subsidized horse keeping expenses, and enough time to pursue their own riding goals.
This seems to be the most viable financial model these days when it comes to dealing with increasing labor costs. Of course, if the BO is themselves an accomplished rider/trainer/professional, and they can offer subsidized housing and board to a good BM candidate… that can work too. But treating the barn manager job like a more traditional position with a good salary, reasonable hours, and health insurance? That seems to be a rare thing across the whole industry.