Of course, Sandman, any line drawn about any aspect of music making is just a line drawn in sand waiting to be blurred by wind or tide. The essential element of folk music, however, is not that it be good music, only that it is performed by folk. Such music can be created at home or for profit, but the trade description of a folk club is only that the music is performed by folk together with other folk. The activity of making music together is much more important than insisting on an entry level quality based on whether or not anyone would pay to listen to it.