Just out of interest: what do you think is on-topic for HN?
Also, from the guidelines.
> On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity.
I think you're misunderstanding the point of the guideline. In set theoretic terms, "good hackers" are a subset of "anyone". Thus, something that's interesting to anyone is by definition interesting to good hackers as well, and is therefore fine. The problem arises when there are too many submissions that are not interesting to good hackers. That's what keeps this community from becoming just another StumbleUpon or Digg or /r/news. If it's not interesting to most "good hackers", it's off topic. If it's interesting to "anyone", to include "good hackers", then it's fine.
"good hacker" is a subjective term and an obvious True Scotsman. It might as well mean nothing more than "your interests correspond to the interests of the moderators."
Also, from the guidelines.
> On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity.