When you watch a musical performance, you are also paying for labor. Even when you buy a physical art object, all the costs involved decompose back to labor. When you have a digital copy of something, there is no labor input to its creation, so guess what the inherent value is.
Animators drew actual cels. Theater workers clocked in and screened the films. The guys at the DVD factory pressed the discs. We paid for all of this already. It's double-billing to charge for copypasting the mere likeness of something. Nobody's doing any work for that.