I make my living full time as a family portrait photographer. Shooting film 100% of the time; expenses, time, insurance, tax etc all calculated, I could not make a living taking anything less that £1,000 average per job. I do now shoot a mixture of film (645) and digital (largely replacing 35mm) to maintain profitability. I also make platinum prints and frame, so take control of the whole process. I know how tough the market is, and I know that nobody much cares about the process unless they can see a difference in the results or cost.
Interesting post. Would you mind indicating how "large" (quantity, print size etc.) your jobs tend to be?