You can see it happen here with the current post: http://hnrankings.info/6310234/
Basically, it seems that submits that don't include an external link degrade faster than other submissions.
EDIT: So this post too will probably go down the ranks pretty quickly because it fits in the same category.
The article at position 4 is 4 hours old and has 78 points.
Definitely looks like flagging. The only reason I can think of is job seekers trying to hide the thread from other potential job seekers.
It doesn't help that it's posted on a Sunday morning. It should be posted the first Monday of every month.
If the expectation is that it would sink quickly, wouldn't employers stop using the service?
 Also for what its worth, the quality of the people that reached out via HackerNews was a lot better than I got else where (I even ran an add on reddit's /r/linux)
If you want a job, show some hustle. If you don't have a job and need one, why are you sleeping in on Monday?
To the heart of the discussion, these should come out on a fixed schedule to give everyone a fair chance.
Of course, in order for those ads to be effective, the rest of the site needs to attract the sorts of people that YC-funded companies want to hire. To that end, it needs to be a decent news site (or something) as well.