Times change. Rock groups record their own material and place it on the internet for free. It's about time writers did the same. How can we really ask for money for an epub document? Surely the publicity is enough, the knowledge that at last there is a body of people willing to read your work? I firmly believe that books, in their digital version, should be considered promotional freebies, to be downloaded and enjoyed by anyone in the world. The printed version is another story, the signed copy, the deluxe collection and the like. But a digital copy?
If copyrights and marketing only serve to close doors, fling them wide open and offer your work for free in epub! It's a fantastic opportunity to reach readers globally - take it!