A stage manager could be useful in the world outside of theater for many jobs and/ or responsibilities.
1. Substitute, you have to be able to control people. (and you have to have a voice)
2. Daycare, sometimes people can act like children, daycare could be excellent pretheater experience.
3. At home, sometimes families get a little crazy and they need a calm, cool, and collective person to keep them in check.
4. When you want to here really funny theater jokes... or is that just me?