Many companies/publishers/authors simply do not see the value in duplicating their effort and making multiple formats, each of which has to be maintained, edited and compared to each other with every small change. And as various sources publicly credit Amazon a healthy 70%, give or take, of the ebook market (whatever Amazon itself says), picking a Kindle-only product would seem to make sense for a lot of book producers.
It's the same attitude that kept publishers from releasing backlist books as ebooks (of any format), until they were convinced there was a reasonable market for them.
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