A good point and the answer is probably laziness. I travel a fair bit and so throw my ereader into my pocket, whipping it out whenever I have a spare moment. Often I end up in a Travel Lodge type establishment and spend the evening reading, often in low light (hence the backlight). The add-on light is a good idea but then I have to remember to take it and it's another thing to lose. Bear in mind that I only take usb sticks with me if I can attach them to my keyring - forgetfulness is common for me!
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