I don't get this Amazon CD vs. MP3 pricing

[pinkoos]

Example, this Young the Giant CD:

http://www.amazon.com/Young-Giant/dp/B00..._1?s=music&ie=UTF8&qid=1371581141&sr=1-1&keywords=young+the+giant

By the physical CD for $3.99 (and it's even Prime eligible) and get the "AutoRip" MP3s for free.

However, if you just want the MP3s, then you have to pay $9.49:

http://www.amazon.com/Young-The-Giant/dp..._0?ie=UTF8&qid=1371581141&sr=1-1

Is this some kind of licensing issue or something like that?