I have emailed authors before and it has not been very effective. Some of the lesser-known ones did email me back and were very concerned when I said I wanted an ebook and couldn't find one and this had cost them a sale. But others ignored me outright or wrote back to say that it wasn't up to them and they had no idea what to do. I am sure many of these authors write off emails like mine as a one-time thing and don't realize how many people read ebooks. A sudden tank in their amazon ratings will surely get their attention and is one of the few ways customers have of taking action that people will actually notice and act upon.
I have heard stories about the iTunes app store where people wrote a bad review about a technical aspect, the problem got fixed with an update, and the programmer emailed those people and asked them to modify the review to reflect this. It seems people take reviews more seriously than emails because it affects their status in a more public way than one disgruntled customer contacting them privately.
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