Ask HN: What's considered good traction for a startup / idea?

A startup I'm working on is seeing a > 10% conversion rate and we're excited about that. But I've recently started to wonder, what is considered a good conversion rate by other startups and/or money people?

Then with the recent number of startup traction / promotion related posts to HN, I see that it's not just a conversion rate question, but also a number of users question.

Obviously market plays a big part in what's considered a good number of users. 100 might be good for a niche market. 1000 might be good for a general hobby. 10k might be good for a general consumer product.

So that brings me back to the conversion rate bit. Of the people that land on a startup's site, what is considered a good conversion rate for signups? Is it different when you actually have a product vs just a landing page / invite list?

Thx