iTunes Lameness

I love wireless. Lately I've taken to sitting out down on the porch during the day when it is nice out. The wireless signal there is great and it's covered so I'm in the shade (with no glare issues). I've also been making use of the music sharing feature of iTunes a lot because of it. Also, since I'm driving between Boston and Hartford a lot I've started getting into audiobooks. Currently I'm on the third book in Stephen King's The Dark Tower series and it has completely sucked me in. This morning I sat down to listen to the last part on the porch (something I hadn't done before) and discovered that iTunes won't share out audiobooks from audible. What the hell? Audible? Apple? What's the story here?