I'd also add that ever since I figured this out I've wanted to invent an ebook reader that actually gave you a third dimension, multiple (say ~20) eink pages with perhaps an additional tactile slider on the binding as you progress through the book.
Maybe it'll become feasible as the price for flexible eink displays drops.
I think (again, my personal experience) that reading while also having a tactile sense of where I am in the book (say ~20% of the way through) makes it easier to remember smaller details; perhaps the physical book helps my brain create a sort of "memory castle" that a little progress bar on an ebook does not.
One example: I read all but the latest Game of Thrones books in paperback (well before the HBO show was even announced). I devoured them and was able to keep track of all the families/storylines without a problem or a second thought. I tried to read the latest one as an ebook and I found I'd have forgotten details of various storylines between reading sessions. I ultimately never finished it and I'm just watching the TV show now :|
Now when I want to read a book, I buy a book - I just can't get into ebooks. Sure, it's not as convenient, but it also doesn't need to be plugged in, ever.