I (myself) do not use EPUBs or have any book reader device.
But all people I know are paying library fees but also use the DeDRM plugin to have
no restrictions in their own ebook usage.
Sharing is really not the main use case (or let me point out it is no use case in my social environment) because normally every person has its own interests and preferences regarding the particular books.
Because of that the use of Calibre is a multiple "single person show".
So in the end it is the desire for beeing time independent without having the overhead
of the library accesses and management in short frequently periods.
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