> Also, it feels weird when I post comments on AO3 and never get a response back.

This.

Sometimes when I'm gobsmacked at just how amazing some fic is, it takes a bit to post a coherent, appreciative comment for the fic. And then to not even be acknowledged? I know artists,a uthors, etc don't owe me a response, but it still feels good to get one. Then again, if I look at comments and see there's no author response, I may not even leave one.