If you're an author, you can use Leanpub (https://leanpub.com/). We added #VATMOSS support, so you don't have to. We did this since we looked at the situation and decided it was the correct thing to do for our authors, even though we're based in Canada with our servers in the USA, and with no physical presence in the EU whatsoever. We also added "bring your own book" support, so you can just upload your own PDF, EPUB and/or MOBI files instead of needing to use our (awesome, Markdown-based) book creation workflow.