Here in the Pacific Northwest, the vast majority of people under 50 seem to be in polyamorous relationships. I’m fairly new to poly, but I’ve done a lot of reading and therapy, and it’s working out pretty well for me.
I do tend to be people’s anchor partner, so I’ve admittedly never experienced the pain that comes from being a secondary when you wish you were a primary. My anchor partner tends more towards relationship anarchy and doesn’t like hierarchical relationships, but i made it clear that my expectation is to be the priority in her life. We’ve made it work, although it takes a lot of communication.