ProfCrash, rest assured I fully respect everyone's private preferences.

I'm simply suggesting alternatives, trying to compare the advantages and disadvantages of every option.
Rhialto, because you insist on having all your e-books physically present on your iPad all the time, then the initial loading of the books you already possess now will be a
one-off affair for you. No need to switch to iBooks because of a one-time process!

So, why not make use of the direct Marvin <-> Calibre connection to load your books into Marvin for the very first time? It will only be necessary for you to use Calibre's content server
once. Marvin will allow you to load
all of your 2000 books using either the OPDS catalog access to Calibre, or the web access to Calibre.
After you're done, then you should be able to easily and
automatically locate any new books subsequently added to your Calibre library, because Marvin's Dropbox feature lets you display all books in your Dropbox account using the "Newest on Top" sorting. I haven't tried this, but this should -- at least in theory -- ensure that whenever you add a new book to Calibre, it will automatically appear at the top of the Dropbox listing within Marvin.

Please test this; I'd be interested to learn if that actually works as intended. (I have no way to test this, because I store my Calibre folders in SugarSync, and I'm comfortable with loading books from the SugarSync app whenever I need a particular book.)
PS: Thanks a lot, Dale, for clarifying that orphan paragraph prevention query.