I think society needs people like you (assuming that you feel the way your post portrayed in the collective sense), people who will aim high, never be satisfied and probably not get stuck in a rut. I think it's great that you feel that way.
However, not everyone feels that way, many many people are perfectly happy to do (what might seem to others) a mundane job very well for years on end. In my "career"(cough), I managed small business accounts and helped people who wanted to start businesses at the smaller end of the scale. The pay was crap (for London), I would never have got past the 25k barrier, but I was perfectly happy and used to turn down promotions all the time because I was really, really happy in my work and good at it. Someone like you stuck in that kind of job for years would have gone insane. I loved it. I loved the fact that I knew it inside out, didn't give a crap about new challenges and stretching myself, and I think there are plenty of people like me out there too.
It takes all sorts.