Most workers do have an agenda other than enriching themselves though:
* Self-satisfaction
* Sense of identity
* Belief in the company
* Desire to improve the world
* Puritanical work ethic
* etc
* Self-satisfaction
* Sense of identity
* Belief in the company
* Desire to improve the world
* Puritanical work ethic
* etc
But it's not a purely transactional agreement like you make it out to be.