Why would anyone buy audiobooks from Apple, when Apple treats them like an afterthought of an afterthought.
Audible lets you:
1) download your books far more easily
2) keeps them in sync better between devices (does Apple even do that, much less do it well?)
3) has a dedicated Player app that's well suited to book listening (chapter markers, notes, easy backup and jump forward by several seconds, etc.)
4) is generally more economical.
5) Doesn't throw out...