I think this is a hard thing to capture. Look at some of the charitable organizations like the Royal Conservatory of Music. If you look at what they do, between the educational aspect and the presentation aspects and so on, it is absolutely impossible that they aren't serving, not only a charitable purpose but an important purpose in society and in the community.
That should be supported. I can tell you that if they were paying the same amounts as commercial producers, they would not be able to provide all that they do.