I was read to as a child and loved stories. I too loved the Nancy Drew books, and Point Horror, but stopped reading for pleasure through secondary school. At college we started reading A Clockwork Orange in class and I was so blown away by it I took it home and finished it that night. Never stopped reading since and did Eng. Lit for my degree.
Some books are just so amazing you pick up the next one in the hope of the same buzz! Escapism is a major reason too!