I can agree that supported e-book formats are not very important for some group of people who can spend 2-5 minutes to convert original ebooks from one format to TXT, PDF or any other formats but the problem is that not ALL people who read books and ebooks familiar and know how to do it. Many people have zero knowledge how to do it and don't want to study how to do it - they just want buy ebook, download it and READ.
The supported e-book formats and resources where to buy books in this format very important for these people and open ePUB format can be a good solution in the future.
For example when I buy MP3 player I don't think how to convert musik from different formats to MP3 format. I just know that MP3 files will be available and it will work on my player. The same situation with eBook readers - if users can download ebooks in universal ePUB format they will make sure that it will work on ANY eBook reader. It just takes time to make ePUB format more popular and many big publishers already work on it now.
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