Why is it so difficult to freelance as a filmmaker in Chicago?

In a big city like Chicago one would think that there are many film/video freelance opportunities. Yet I have been living back in Chicago for over two years and I have found very little work in the field. Does anyone know why this is? I post ads on Craigslist for my cameraman and editing services, yet I do not receive any interest. Is there anyone out there who can point me in another direction for film/video opportunities in Chicago. There must be a need for filming/editing projects in this huge city.