Good folk, in the sense of true folk is about that most unfolkie of things charisma. It comes in many forms, the guy in a corner singing through - but not necessarily about - a lifetime of pain, the loony girl hunched over her Martin, it might even carry a three pin plug. It may hey nonny no, it may not, but it will always light up a room like an arc lamp.
So much folk is off the peg despite its credentials and performed with the kind of cod authenticity we know and love/hate. Perpetuating a tradition is no substitute for keeping it alive and neither have much to do with entertainment.