Google is apparently launching audiobook support through its Google Play Books app. For some reason.
The search giant doesn't really cite usage figures for any of its entertainment services, which include movies and TV shows (Google Play Movies & TV), music (Google Play Music), e-books (Google Play Books), and magazines and newspapers (Google Play Newsstand). You can see that these apps are downloaded frequently---some over a billion times---but they come with Android, and I think these figures are suspect. More to the point, I think actual usage is very low. Like all of you, I don't know of anyone who is an active user of most of those services. (I do use and enjoy Google Play Music, but that is an ephemeral thing---where you subscribe, not buy---with no real lock-in.)