This is really apt metaphor of how poly people get treated by their monogamous friends all the time. This attitude is why poly support groups exist.
"Polyamory and a sports metaphor"
There is a saying that I heard once from Ken Haslam, who curates an archive of polyamory materials for the Kinsey Institute: "Nature loves diversity; society hates it." And it's true. With so much wonderful diversity in the world, we as a society seem determined to make everyone fit into our own preconceived notions, whether it comes to race, gender, religion, lovestyle or any of an infinite number of ways we express our humanity.
If this competition can open some people's minds about the possibility of happiness outside the traditional model of monogamy, it will have done some good.