I can see why a person might not want to let others know they were reading books like that; it can be a very personal subject dealing with problem personal or family issues. So yes, there might be something to those being popular on Kindle, allowing some privacy and anonymity to them. There may also be an issue with people being uncomfortable buying such books in public stores, leading in turn to those stores cutting back on offering books they expect no one will come in to buy...
OTOH, it could simply be a case of such books being easier to find in the Kindle store than in your local store, being that they tend to target small demographics, something the public stores are not catering well to these days.
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