Least-Interest Factor

I was just talking to a friend of mine who is a big believer in the theory of the "least-interest factor." The theory is that the person in a relationship who has the least amount of interest is the person who holds all of the power in the relationship. Then, as the theory implies, the best relationship is one of "zero least-interest." I think there's a lot to be said for that theory, though, it seems to me that relationships are fluid in nature. The least-interest is sometimes exchanged back and forth between two individuals over a period of time. I'm not sure how one goes about using this information in a useful way. Maybe it's possible to work to a zero-least-interest point? I'll have to think a bit more on that...