I read this post through my friend CP and thought it was rather interesting. It is a bit long but a good read if you are a reader and or a writer.
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Recently, we here at LitWorldInterviews.com conducted a survey, “Why do you put a book down?” and through the assistance of the writing community we had a very nice response. Now it’s time to share…
Source: Why Readers Stop Reading a Book.
Sharon C. Williams-Author 
I was surprised proofreading and editing so high on list, as for me, as a big reader, it is pretty much always that I am just not into the story.
That is also important. If the story is not working for you no editing or proofreading in the world will save it.