If someone wants to engage in such a relationship, who am I to judge? It's not my cup of tea, I'm far too jealous and stuff for that, but I'm not about to cast judgement on people just because they have a different kind of legal, consensual relationship. If it makes them happy, then it's whatevs.
This comes closest to how I think about it. It's not only about being jealous for me, it's that I don't think polyamorous relationships are healthy relationships; I would certainly to want it for myself. However, that doesn't make people who engage in it HPs. If they feel that it works for them, I'm not going to judge them and I hope they're happy. Live and let live. Voted "other".