Every time I have broken down a manager's salary for a movie theatre, it works out to about $7,000 per screen with a floor of 18,000. But seeing as it is a small town, I'm guessing that the person will only be paid at the most $30,000. What I would suggest is that the manager ask for the minimum they need to live on while negotiating clear performance bonuses. The manager could get a percentage of the concession stand. They could be paid a bonus based on the per-capita income of the concession stand. There could be a marketing bonus for every mention the theatre gets in the local news.
A manager of a movie theatre should also get full medical, and a 401K plan.