Originally Posted by EatingPie
A very good question.
The business reason would be that they only have to produce one book format instead of two. Beside that, what's to stop another player from coming along and demanding books in their
Amazon may pay them to release in .mobi format, and that would settle that. OTOH, Rowling herself owns the digital rights and (presumably) makes the final decision on anything. I don't know how easy it is to bribe the richest woman in the world!
You should know that Ms. Rowling owns an ebook reader-a Kindle.
. Somehow I doubt that she objects to her books coming out in mobi. format or is concerned about geek ideas of "openness".
If anyone seriously thinks that the Pottermore business team is making decisions based on which format can better handle hanging indents or image re-flow, well, they just don't understand the situation.