I don't know whether it's a perverse need to fan the flames, but I figure that since the same questions are getting asked, I ought to put my explanations up for all to see. The first set of questions are about my design style. So, let's take my color scheme first. Black backgrounds aren't popular among graphics designers.
Ink costs money.
People aren't used to reading light on dark. I think I can justify some reasons for this. When I work in with reflective media, such as paper, the overall lighting of an environment is fairly constant. If I look from one book to another, I'm not forcing my eyes to adapt to heavily different lighting conditions. Furthermore, it's only recently that we've started to get high scan rate monitors.