This is my theory of the secret of making money out of folk music. First, think 'singing and dancing'. Listeners expect songs to pour out of radios for free 24 hours a day, but dancers still expect to pay the door. Acquire a few like minded friends, work up a few sets to slip between the songs, then pitch for St. Patrick's Day gigs, Burns Nights, etc. Hava Nageela will net the barmitsvah market. Expand into weddings. In no time, you will be on the television, guesting in movies, and cutting record deals.
I give this advice as a free sample. I am now working on a theory on how to make money out of theories. Send no money now. But watch this space. It's virgin territory. We could be talking serious bucks. Only selected applicants will be invited to invest.