Who's to say whether the artists who perform don't have to make some sort of hefty monitary contribution to the "cause" just to be on the bill? 
Just because the artists get free publicity and don't get monitary compensation for their performance doesn't mean that they don't have SOME sort of outgoing monitary obligation in order TO perform.
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Among God's creations, two, the dog and the guitar, have taken all the sizes and all the shapes in order not to be separated from the man.---Andres Segovia
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