> I just dont really understand them.
When I want to read a book, I usually want to read it NOW. Which I can do. Buy on Amazon, turn on WiFi on the Kindle (usually off to save on the batteries), and a few secods later, it is there. And a few more mouse clicks, it is on my wife's Kindle as well. And I do not need extra space in my luggage to carry the book. Or all the other ones.