Copying music was once an industry that required massive capital for both the recording and distribution, so these had monetary value as services to the artist and consumer.

Now the artist can own their recording equipment outright and no longer has to rent it and the distribution channel, while not free, is so cheap it is given away in order to help sell coffee.

So, digital music is not only nearly devoid of monetary value as it is no longer an industry in and of itself, but from a commercial perspective is the advert for the live show and so can even be viewed as a marketing cost.