I've reached that point where if a fic isn't offered in a way that I can easily transfer onto my ereader, it's not going to be read by me. Now, that can be via AO3 or via a story posted on a single page - either DW/LJ or one's own website - but if I have to go through a half-dozen links to get the whole story, I'm no longer taking the time to combine files into one ebook. I don't mind taking the time to do a conversion myself and since I actually tweak even epubs so that they are formatted in the way that works for me, I am willing to work with many different file formats (excluding pdfs) but there is more fic out there than I have time to read and I'd rather be using my reading time for actually reading, not creating files out of multiple pages.
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