My films play only in Bengal, and my audience is the educated middle class in the cities and small towns. They also play in Bombay, Madras and Delhi where there is a Bengali population. ↗
Most of the top actors and actresses may be working in ten or twelve films at the same time, so they will give one director two hours and maybe shoot in Bombay in the morning and Madras in the evening. It happens. ↗
Well the Bombay film wasn't always like how it is now. It did have a local industry. There were realistic films made on local scenes. But it gradually changed over the years. ↗