I don't view startups trying to get on Hacker News as a bad thing. Especially if the startup is providing information on how they solved a problem (Like I mentioned in the article about "Stadium Pitches").
Agreed.
I still think you should change your username, though :-)
Hacker News is seen as a social news site, thus a marketing channel to many people, just like Digg, Reddit, Huffington Post, and so on.