I have no idea how many books I've bought from Amazon or other sources. So, I can't say where the majority of my books come from.
I do use Calibre, as a book organizer. I don't use Calibre to reformat my books (only to extract the HTML from kindle books), nor to edit my metadata. I reformat each of my books by hand, making the epub using a batch file and creating the Kindle format from that and the PDF from the HTML (by using LaTeX).
I use the tools made by Alf, but not with a Calibre plugin (didn't even know there was one...)
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