Volume would be my guess. No sensible firm bases a decision-making process on only one data point or a single source of insight. This doesn't replace an editorial perspective, but it brings an additional data source to help and I imagine they could probably source more beta readers more quickly through a scheme like this than through trad. means. Netflix do similar things with their content development process. eBooks have effectively instrumented the reading experience - so how fascinating to learn how people actually read.
Now, what would be really interesting is to correlate that readership data with other sources of data - like location, time of day or weather. I wonder what you would learn.
We have learnt very, very little from location
Weather may influence your reading time, but no correlation yet with *what* you are reading. whether you will finish that book or not, so not terribly interesting either
but *time*, time is *Very*interesting
from Netflix we borrowed the concept of "velocity" (a.k.a binge watching) how long does it take you to read a book from start to finish with all the pauses, your need for sleep and the distractions life throws at you - velocity tells you a lot about how strong the pulling power of a book is
is a book primarily read during commuting hours and lunch breaks, in the evening or on weekends, is it2snackY" or is "immersive" time can tell you a lot in that respect
time also tells you what percentage of the audience literally can;t put the book down, i.e. is a quite literally a "page turner" or "un-put-downable"
time also tells you if your audience hs a lot of time (reads any time of the day", busy people (Only an hour of evenings", weekend readers and lot more and base don that you can figure out which books fits which audience better...
so far very few SciFi books have been tested, I guess that's because SciFi books don't get much in marketing budget? They are left to fend for themselves? WE work with Penguin, but not ACE, we work with Macmillan, but not Tor and so on... They have shown little interest...Ditto Baen etc.
Big sigh, because personally, I like to read SciFi (Fantasy is getting tested, but I don't identify with that in the same way, I am more Charlie Stross kind of reader... not too surprising if my profession is reader analytics and technology?)