They are the people worth living for. We love because it's the only true adventure. If you obey all the rules you miss all the fun. You can't have your cake and eat it too. But love isn't cake.
Love is the only infinite resource.
Polyamory gives you a model of relationships that includes rather than excludes people. It advocates, if you're so inclined, that you expand rather than limit intimacy in your life. They are a powerful source of nourishment to relationships. What a grand feeling to have a relationship with someone who is loved not only by you, but by many. That means you've made a good choice.