Honestly, I don't see any relevancy in the statement of this project. Using kindles and other ebook readerds for about 6 years and always asked to recommend one, I've learned that ebook readers are one of the most realiable devices ever built, so you'd better buy a used one and take it off the market than produce yourself another devices honestly no one needs at the moment. A lot of the people buying ebook readers usually end up ditching them just because their 'reading hype' didn't catch on, or their company's read and roll program (we have Bookster in Romania) is cheaper to use (as it's free) than buying and converting books all the time.

But, ebook readers are cheap and easy to use (if bought used), even kindle's amazon. Since you have a kindle e-mail address you can just use an app to convert every non-kindle-format file into a compliant one, that's it if you don't want to use Calibre via USB or WebServer. I use eBooker on my Android phone.