I don't know what kind of book you make, but do you need to embed fonts? If it is fiction you shouldn't need to embed a font unless you have very good reasons to do so (non standard glyphs etc.)
Amazons drm is very easily removed. If that is costly to amazon is a highly debatable question. Some buy there because it is easy removable, most people don't know/care. I would say, it costs them nothing compared to the cost of more sophisticated drm systems (that would be broken too) and they only have it, because publishers want it. Maybe it helps against casual misuse.
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