Also because it uses battery and goes dead! And reading the newspaper wouldnt be as fun! not that i read the newspaper, but its similar to reading a book, reading a book on 'real' paper is way better, than sometimes having the computer freeze on you, if it was a wireless laptop and the battery was low, you have a book which you can read for as long as you like.
But i do agree reading on the computer is also fun. They're both kool in their own way, but reading from a book is better in my personal opinion, as their are more advantages from a real book, just my opinion, dont get angry people!
Apologies if i went slightly off topic.
.. peace ..