I don't know if that's the reason, but I've flagged your post by accident (wanted to click "comments"). But then I unflagged it, so this doesn't count?

Anyway - maybe someone thinks it's too repetative to add each post to hackernews? I don't think so (because I think of getting pasive income myself and find your post interesting), but I can understand if somebody did think that way - after all people interested in your posts could go to your page to read next posts, if they wanted to.