I don't tend to leave kudos or comments for side fandoms, weirdly. I know I should, but I put so much effort into my comments, sometimes I just want to read, be alone in my head, not reach out. It's different if it's a friend or an author I love.

SGA, on the other hand...the fandom is so small. I try to leave kudos and a comment on all fics, unless it contains something that I really don't care for (in which case I will just skip over the fic). I tell myself the author won't even notice...

Hits absolutely aren't any form of feedback. Kudos are the absolute minimum you can give an author to show appreciation. Even a comment saying, "Great fic!" can be heartening.