I have 85 works on AO3 and I get a kudos email almost every day. Usually just for one to up to three fics, one kudos each, occasionally for more. Occasionally, there will be several kudos for one fic, usually after I've just published something new.
There's recently been an uptick for kudos on my old Metal Gear Solid fics which I can't quite understand but which obviously makes me happy.
There's hardly any comments.
I don't have the time for proper data analysis but I was curious and took a look at the comments I received within the last 250 days (arbitrarily because AO3 shows not the date when you've ceceived a comment but a "X days ago").
There were 79 comments* over those 250 days, across 32 fics, from 30 people.
*I did not count replies to my replies (about four instances), nor one person commenting on three separate chapters of a fic in a single day
That there's so many comments across so many fics at all is largely due to one single person, a dear friend, going through a lot of my fics. She managed to leave 21 comments in those 250 days!! That's almost 27 %, more than a quarter of all the comments in that time frame!!! (you know who you are and you know I love you for this!! 💕)
(how did we meet and become friends? She commented on one of my fics and we started a conversation; now we're tumblr and discord and Xmas card friends!)
38 of the 79 comments were on the date of publication (+ 1-2 days) of a new fic and there were 6 new fics in total (some mere ficlets but nvm), which averages out at about 6 comments per new fic, all on or around the date of publication.
Out of all of those 79 comments, only 13 comments came from people totally unknown to me (and 6 of those 13 were on one single fic in one recently popular and very active fandom).
18 comments were by people unknown to me, which have commented before though (and in total that was just 7 whole people). They might be subscribed to me or follow my tumblr because almost all of those were "date of publication" comments.
All the rest, 48 comments, are from people I personally know and am friends with (now) or at least tumblr acquaintaces with, which are actually just 11 people. And we already know one of them is responsible for 21 comments, which leaves 27 comments for the other 10 people, most of those, again, "date of publication" comments or "saw a reblog of mine on tumblr" comments.
I don't know how comparable my AO3 experience is with others because there's so many factors that play into this.
I don't know where I'm going with this other than me being incredibly grateful for those (tumblr) friends who are still loyally reading my fics (which is mostly 4 people + an assorted variety of guest stars) and I dread the moment they move into other fandoms.
It's putting some numbers to that feeling that if your story doesn't get read on that date of publication (or at least the first few days after), the chances of anyone commenting on it sink dramatically unless you attract the rare unicorn who will not only read and kudos your fics once they discover you but will also leave comments.
It's putting numbers to "the fanfic community only really works if we're a community" because strangers are so much less likely to leave a comment. It's "I know most of these people are writers's themselves" and know the joy of receiving comments. They don't see themselves as "consumers of content".
I am grateful I can get a little serotonin boost in the form of AO3's kudos email almost every day. But at some point, when my brain is not being kind to me and the world, you can't help feeling a little disgruntled at all these people who obviously read your story but didn't stop to say 'thank you.' Didn't say 'I liked this.'
I don't know where I'm going with this but to the people who still comment on my fics: