Arguably not so much with music anymore given the prolific nature of lossless DRM free downloads available for purchase.
Personally, I buy more music now than any other time in my life: high quality sources playable on all my devices.
Most music is sold without digital restrictions, and many video games are also sold without digital restrictions.
For one thing, DRM also works in Amazon's favour (reselling multiple copies)
For another, DRM is a pretty big sticking point for copyright holders, music, text, whatever. It's the one big thing that publishers all think that their business model depends on