Believe me, it is worth it. Roughly calculated, airplay of a single song on a local radio station will get you perhaps 30p. But then you share in the allocated pots for things like music played at hairdresser's etc, and before you know it your 30p has become a fiver. If you are a performer and sing your songs at a festival, that means probably upwards of a dozen songs x £2 or £3; and so on. It starts mounting.