I'll put my colours on the mast:
Tl/dr: I post here because I'm interested in the royal family and I don't know anyone in real life that is.
Longer story: my mother was fascinated - and had a very good knowledge - of the contemporary (to her) royals. She also disliked them enormously: "It's ridiculous! Some poor old woman, without two pennies to rub together, saying 'God bless you, Queen!'.
I'm probably a very watered down version. I'm a republican but feel that, while they're here, I might as well enjoy the spectacle. I'm certainly not a revolutionary; I enjoy my comfort too much.
I don't know anybody that's particularly interested in them these days. Generally, I would say, most people I know are mildly pro and I have some great discussions with my daughters re clothes.
But no one feels as strongly as some here. And, while that can be scary, the discussions can also be fascinating (sometimes in the way of a car crash...).
I can see that a lot of people now see it as a sort of reality show (Skip Charles! Vote William/Harry/Anne in!). I'm also surprised that people can take so much interest but have so little knowledge about how the institution works or of its recent history.
I could bang on a lot more, but won't because this thread will doubtless sink below the waves!