Poly groups tend to be well-educated well-paid white people
I'm baffled by this. Are you saying most studies tend to be done on this group? Do you mean in the US? Are you referring to groups who call themselves poly, or the general practice of honest nonmonogamy?
Yes, yes, and former.
Recently, LWers Will Ryan and Divia Melwani (now Will and Divia Eden) were married, with Eliezer Yudkowsky officiating.
I've been to 40+ weddings in my lifetime, and this was my favorite ceremony yet. Here is the video, and below is the transcript of Eliezer's... what's it called? "Blessing"?