> Please don't use HN primarily for promotion. It's ok to post your own stuff part of the time, but the primary use of the site should be for curiosity.
This is more or less artifact of HN algorithm, it's common to get single digit votes for majority of your posts. Whether something blows up feel almost random, you have to get pretty lucky to hit a time window when there's not that many posts or a lot of people look at new page and upvote the post at the same time to make it snowball. Many links are posted multiple times with no traction and then they suddenly blow up on 4th attempt.