If Amazon is doing this of their own volition, I'd say that you have no personal responsibility whether you play them or not. It's strictly between Amazon and the RIAA. You're also protected by a legal precedent that came out of dishonest businesses that would send people products that they didn't order and then charge them for it, or add things to a real order. In short, if you didn't ask for it, you don't have to pay for it.
Now if only Amazon would do the same thing for all the books I've ordered from them. I'd love to have e-book versions too!