I noticed the stats on my profile at @circlecount that I'm averaging 113 views per post. I've got 178 followers. If every follower logged on fairly regularly and only checked Friends and not Noise, I could assume that I have 113 of my 178 followers who put me in Friends. It's not that easy, though - some of those views could be on posts that got multiple views because a conversation was triggered and people kept revisiting it. Also, folks DO check their Noise feed sometimes (I think you have to actually select the post from your Noise feed for it to count as 'viewed') so if lots of people are doing that, it could register as well. So take that 113 and subtract a few for revisits and Noise clicks. Oh, but you can add those followers who have you in Friends but rarely ever look at Ello. So the number goes back up a bit.
I figure, then, that probably 80 or so of my followers have me in Friends rather than Noise. It's just a guess, but I think it's a good conservative estimate. I'm pretty freaking flattered, honestly.