It’s the age old question, whether people are enjoying the story. True, I’m writing for personal enjoyment, but there’s an extra level of effort required for polishing & posting (or publishing) a story; thus, some positive feedback is appreciated (& constructive criticism). TV producers have the Nielsen Ratings, publishers have sales numbers, and we have dragon prints (other archives have hit-counter equivalents).
Discerning whether a dragon print is a hit-through, a random check, or a devoted reader is tough to do; similarly, book publishers don’t know from the sales figures, how many physical books are actually read vs those that are shelved away for “later” vs those that are burned or used to level furniture. Now, AO3 also has kudos (likes), bookmark counts, & subscriptions – this tells a bit more to the general enjoyment. FFN does have that per-chapter hit numbers, and they do show that there’s a lot who’ll click because it’s on the “updated” list but don’t click through to the freshly posted chapter. (However, FFN’s numbers are now getting drowned out by bots...another topic for another time.)
In the end, for AFF, the best metric is recording the dragon prints, and relish when that occasional review comes through.