Part of that hesitation is based on the experience of musicians with their own streaming services, such as Spotify or Rhapsody — many musicians earn substantially less from streaming than from sales, and unlike musicians, most writers can’t really try to make money from touring (some could. Not many). Now, to be clear, early reports say that the subscription services credit a full sale after someone reads 10% or so of a work (although how much a “full sale” counts for seems to be contingent on several factors, including whether one is “traditionally published” or not — again, see the link above).
John Scalzi asks some pertinent questions about the value of non-library ebook subscription services to writers.
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