http://gigaom.com/2014/07/16/amazon-is-testing-kindle-unlimi...
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No big-5 publisher appears to be participating yet, based on my preliminary glance through the test pages. Simon & Schuster and HarperCollins have both made their ebooks available to Scribd and Oyster, but I haven’t yet seen books from those publishers on the Kindle Unlimited page, though I’m not done poking through all 600,000+ titles yet.
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How much do people read? Nobody's too sure, but it looks like an extremely long tail distribution -- not just a matter of 80% of the books being read by 20% of the readers, but of 80% being read by maybe 5-10% of the readers.
The $9.99/mo price point will work fine for the major publishers if the readers end up on average reading $9.99 of retail-value ebooks per month, but not too much more, and if AMZN's accounting back-end pays them pro-rata for loans. It's like an all-you-can-eat restaurant buffet; some people will pig out, but most people don't fill themselves to the point of nausea, and it all averages out in the end.
However, I suspect it's no coincidence that this is surfacing at the same time that AMZN are renegotiating their ebook pricing contracts with the big five (starting with the current dust-up with Hachette). It's another form of leverage: Amazon can offer it as a tasty extra -- in effect, a commercial library access channel -- for compliant publishers, but can also threaten to withhold access to the new channel if they won't play ball over discount structures.
We actually have a pretty good idea. According to Gallup/Pew research[0], the median American reads 8 books a year. Slightly less than a third read more than one book a month. I doubt any customer who reads less than one ebook (let alone a physical book) per month would find it worth signing up for this service. That leaves the service with mostly heavy consumers of books, which is going to really stretch that $10/mo price point. Since the major publishers already think that a single ebook is worth at least that, I can't see them joining a program that will almost certainly deliver less revenue.
[0]http://libraries.pewinternet.org/2012/04/04/the-rise-of-e-re...
The thing is, Amazon might. They can read the distribution of books bought per unique user annually straight out their database, and them being the size they are, that seems like quite a good proxy for how many books are read per year by people.
In fact, I know that Amazon tracks how much people read. They know how many copies are sold, what people bookmark, what page they are on, etc...
I bet they have analytics somewhere that could tell you all kinds of amazing things about each book. That would be incredibly useful to an author that cared to dig into how people interact with their work.
http://blog.smashwords.com/2013/12/smashwords-signs-distribu...