It seems to be a business decision whether to offer an ebook in multiple formats or not. Deciding, for whatever reason, not to sell through Amazon will mean cutting oneself off from a large chunk of the market.And sometimes the effort involved in doing more than going with the major retailer may not be repaid.
An analogy: (and it is a totally different situation of course) In the 1970s I was working for a start-up company that expanded fairly rapidly. Anyone who has done that sort of thing will know that the early stages, when you don't even have well-defined departments, are among the most difficult. I was wearing several hats, and one of them was recruiter of graduate trainees. The first year I circulated all the then existing British universities in an attempt to recruit out first trainees. I got a large response, but the overall quality was poor and sifting through so many applications took up too much of my very limited time.
The next year, I sent a circular only to those universities with the best academic reputations. This cut down a great deal of the dross and the waste of my time -- and my time was money. It could be argued that it was unfair to graduates of the universities I didn't circulate, and I don't deny that there might have been some excellent people there. But from the POV of efficient use of resources (my time) it helped the business. I was able to recruit some excellent trainees.
A couple of years later, the company had grown quite a bit, we had defined departments for many things and I was wearing fewer hats. I was even officially head of a department. But I was still lumbered with graduate recruitment and I'm afraid at this stage I simplified the job even more by requiring a good degree from Oxford or Cambridge. Terribly unfair on all the other potential recruits who knew nothing about the vacancies, but from the POV of the company we were still getting excellent recruits and it wasn't taking up too much of my time.
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