Oh, but I don't even think the numbers have to be "high" for this advice to apply.
Like I talk to bloggers who don't really have a strategy except to just keep writing and submitting to HN or reddit, but they don't get traction, so they get discouraged and give up.
The point I'm hoping to get across to those bloggers is that they can find readers if they think through from the beginning what topics they want to write about and what channels allow them to reach readers that match. That technique works even if you just want a few dozen people to read your posts.