Unlike developed countries like USA, UK and even other countries like Russia , where millions of books are sold, reading books is not a popular activity in India.
From http://indiaedunews.net/In-Focus/April_2009/Book-reading_disappearing_in_India_-_Javed_Akhtar_7969/
“Do you know how books are selected in some of the homes in my city of Mumbai? They are chosen by interior decorators… by interior decorators! If you have brown-coloured furniture and carpet, you must have brown-coloured books,” the award-winning poet told sources.
Another article
http://expressbuzz.com/magazine/book-reading-a-dead-culture-in-india/65191.html
Reading books (and not just for exams) improves your knowledge and creativity and is important for innovation. The quality of India specific online content is quite poor and there is little incentive for real experts to share their information online. Books may be expensive, but they are worth spending money on.