Someone who always acts just for her own self-interest would be likely to miss out on some important benefits and lose some of the social and personal richness of human action.

Self-Interest

The concern for one's own advantage and well-being, often driving human behavior and decision-making.

Social Richness

The concept that different forms of communication, including face-to-face and digital mediums, vary in their ability to convey meaningful social cues and emotional information.