I suspect this is more for people who don't already listen to audio books, rather like Amazon did with Video. Older or PD titles that don't have a lot of perceived value but that people are willing to give it a try. The downside is that this are basically stream only titles, rather than titles you can download, so listening in the car is going to chew up your data plan.
Unfortunately, they seem to have removed the option to purchase these audiobooks, or at least they did with the Moon is a Harsh Mistress. I prefer to buy rather than stream.
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