I would have thought that the word 'club' is more exclusive than the word 'folk'. It depends what people's interpretation of the word 'folk' is - in some venues it's very wide, and in others very confined, and not necessarily to traditional folk. For those outside the folk world that we know so well, the word 'club' would indicate something which might not be too easy to be part of - we all know differently, of course. :-)

Barbara