Like the rat in the cage we are driven by rewards. It's only human and also perhaps rat nature. Suffice it to say it's nature.
Among company benefits, more often than not employees rank health insurance as the more important. It is estimated that more than 60% of American who have health care receives it through some type of employer sponsored group plan. While various state regulations differ, there are certain benefits to having coverage through an employer. This makes the offering of health care plans a strong bargaining tool.