Music, videos and digital copies

I love combos that come with DVDs, Blu-ray disc, and digital copy. They give you a lot more for your money - or at least they make you feel that way - so you're more likely to buy them. So why haven't music companies started doing this yet? Charge a little extra, but make it look like a good deal by offering to give the customer the MP3s for free to have the music immediately while you wait for the physical CD. After all, the physical CD is phasing out. It's all about digital now.