Premise: that d/s is like the celtic concept of kingship. First the concept of the king. the king in celtic society is directly connected to the people he/she rules. As his people thrive, his throne and power also grow and thrive. So also the D is only as good as the the help he provides using the power granted from his s to help that s become the best he can. Its not unlike the power dynamic in Noble House. in which the fortunes of the people under the Tai pans ruler ship directly reflect back on the status of the Tai pan and his House. And of course if the D is a bad ruler it reflects back just as well. And of course a person who owns property is a fool if he damages it. Because of course he decreses himself. And as should be the case deminishes his House and status.
The position of King is soley dependant on his succesfuly making decisions that incraese his people and the status of his House.