1. Can fully appreciate the cadence and rhythm of beautifully written prose.
2. On the other hand, the horrible clunkiness of language is revealed as well. Some authors really can't be listened to.
3. Let's say you miss an important detail the author so craftily slipped by you. Trying to "re-read" a passage is a far different proposition: rewind, nope, rewind, nope, rewind, wait, this is before that important bit, FF...no, not yet...FF, too far! rewind, FF, rewind, where the heck is it, end up listening to the whole second chapter in reverse order of the scenes...oh, drat, just hand me the book. Over there, under the chair...
4. You can get dressed, feed the cat, wash dishes all while listening to a fabulous story! As long as there's no one to tease you when you scrub a pot for five minutes at the good part. And better check the mirror before you leave the house. Just in case.
5. Be forewarned, people will think you are demented if you start sobbing for no discernible (to them) reason. The pantomime explanation of "earbuds,listening, big woman shot by crass ex-lover, fell in canal, ....oh never mind!" only seals the deal, in their opinion.
6. Can't answer the phone. That's what voicemail is for.
7. All the aural pleasure of talk-radio without annoying callers or knuckleheaded hosts.
8. More mentally engaging and creative than tv or video. You can dress the characters anyway you want (until the author tells you otherwise), even vary it from scene to scene...who cares? You can have your own interpretation of wine-dark sea or bowlegged or flinty-voiced; maybe the Snopes's have an uncanny resemblance to your ex-spouse's cousins by marriage.