Near the end of the video, Campbell is asked about the Weston Price Foundation, and his answer is very enlightening, to say the least. Have a look and see what you think.
Fallon, author of the book "Eat Fat to Lose Fat," is herself fat. That should tell us all we need to know. I ate only what they recommended for a few years, and all that happened was I gained weight, still felt sluggish, still had anxiety attacks, and my mood didn't improve, which told me all I needed to know.
Yet all those symptoms went away less than a week after giving up meat and dairy. It was remarkable.
To answer your question about members, look at the WAPF's website if you'd like to see their major contributors (members). They're not hard to find there -- all the links selling their products are in plain sight.