Why? The underlying business model of "being a middleman and take a 30% cut" seems pretty solid. Is it because nobody would be musicians? This almost sounds like "nobody goes there anymore, it's too crowded". If nobody wants to produce music because the ROI is too low, then some musicians will drop out, and the ROI for the remaining musicians will go up because there's less competition. The only way this will fail is if people aren't willing to pay any amount for music, but that seems unlikely.