The primary reason is that a lot of people do not like the idea of having to buy a seperate book light that will clamp on to the cover and light up the kindle. Glowlight has the light built in so in a way you could say that its sort of like customers want to be able to get something for $0. Also its more troubble to work with an external light that will need to tuned on or off and proprietary light bulbs will be needed at an extra cost. So you could say that customers do not want to go to the expense and troubble of adding a light to the kindle and a desire to have somehting for $0.
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