I bet a lot of people are situationally poly - they fall in love with someone already partnered, and become part of a group.
I never thought of it before but I'd agree. It would seem more likely that's how most Poly relationships begin...as actively pursuing one would probably difficult. Imagine the conversations with new acquaintances or long-time friends, "So....have you ever heard of Polyamory?" I'm sure that wouldn't work out in too many cases. Lol.
Oh, and thank you. It's still a work in progress.