A hacker is like an artist. Someone who gets satisfaction out of creating something. Anyone who enjoys learning new stuff.
When it's just a J.O.B. and there's no passion, then it is not hacking. Many people programming in large corporations are not interested in challenging themselves with new stuff. Their biggest challenge is getting through another dreary day and not going postal on the pointy headed boss.
Maybe it's coz they don't hire hackers!