Ask HN: why do spammers target HN?

on http://news.ycombinator.com/noobstories you see a lot of spam. A small percentage is blog spam with a technical subject matter but the bulk of it is totally unrelated to technology, hackers or business.

I'm wondering why the spammers continue to spam this site when there is virtually a zero chance that their submission will make the front page. I'm guessing they don't specifically target HN but instead are using spamming software which posts to various sites in bulk.

If that's true, I wonder why the authors included HN in the list of sites to post to. Are they just taking a shotgun approach and hitting any site they can or is there a method to their madness?