Each person who is seriously involved in socionics has his own reasons and personal history that led him to this. My own interest in socionics is based on several things:
- my innate curiosity about people and relationships: how and why do people differ, and how and why do relationships differ?
- my interest in personal development: how can I identify and rid myself of ineffective behavior, thoughts, and sentiments to lead a balanced and fulfilling life and achieve the clearest possible perception free of projections and the influences of random emotional and cultural baggage?
- my innate desire to help people discover their unique individuality, have fulfilling relationships, and do good things in life.
- my inborn, deep-down conviction of the possibility of deeply fulfilling, ideal relationships that would make a person feel happy and whole; personal experience that demonstrated the impossibility of such a relationship with most people, and experience that proved that my ideals could be met through duality as understood by socionics, and that other people whom I was not compatible with could experience the same thing with other partners.
For some stories of how people have found out about socionics, here's an interesting link.