I know one very good reason why a person might want to use Kindlefix and KindlePID on BoB eBooks. To convert books they have already bought and might not have read yet. I'm planning on buying a Kindle in the next few weeks, and I have mobi books on my BoB bookshelf.
It's a purely artificial restriction that prevents me from reading those books on a Kindle. They use essentially the same file format and DRM scheme. It's a clear case of vendor lock-in and I don't intend to play along with it if I don't have to
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