If your customer base largely consists of the kind of people who read HN, there's really no better place to launch.
I had immense success launching my startup naming business here[1], the conversion rate on clicks from HN exceeded 1%...
On the other hand, when my Photoshop business made the front page[2], it didn't bring in a single new sale. Essentially, it all comes down to who your real target audience is.
[1] http://news.ycombinator.com/item?id=2257572
[2] http://news.ycombinator.com/item?id=2063061