assuming that it's 8 hours work, and the cost of film/developing/prints is $20 per roll, that works out to an hourly rate of $40 per hour for the photog just for labour alone. $40 per hour for 40 hours a week x 52 weeks in a year / 12 months comes up to almost $7k earnings per month. not bad at all (of cos $7k per photo session is even better)