You're not way off, digital is superior and less wasteful in theory, and in a progressive society we'd have already realised that digital goods should be transferable and should not expire (= should not have DRM), certainly not sooner than physical goods! We do not live in that society atm (:

A practical example from experience: a steam game can only be gifted (aka transferred) to another account if you buy at least a second copy/key. The first copy is therefore less valuable than a game on a physical copy, that I can lend or gift to a friend.