People who possess rare things often manage them in one of two ways. We either let everyone know we have it, but keep it hidden, or we are generous with it and allow others the opportunity to appreciate it.
Keeping rare things to ourselves makes us feel special. It offers inner confidence that we too are something special. No-one has what I have. Following through the logic leads to pride, arrogance and eventually an elitist mentality.
Being generous with rare things does the opposite. Because others are able to appreciate the beauty and significance, the value increase. The acclaim goes up, and so does the desirability. By sharing access to rare things, its value increases.
Perhaps the rarest thing of all is the willingness to share our accomplishments with others.