2) Agreed, but that's a challenge for the engineers, not something we should blame the user for. Users have unequivocally spoken (Look up reviews for epub programming books on Amazon, usually they just want a PDF).

Interesting – I never noticed a difference in battery life when I was reading MOBIs and PDFs on my Kindle, but the slow refresh rate made scrolling through PDFs a nightmare. I do notice that reading PDFs on my iPad is very light on battery compared to reading web pages, but that’s because those web pages are running a bunch of JavaScript and using my internet connection, whereas with a PDF I download it once and then read it for hours.