Ask HN: What is a reasonable level of bug reports for a web application?

We are a two developer team who just release a web application to solve an issue in an existing online community. It was a rush job (we only had 3 weeks to get it done), but we pulled it off and we are fairly happy with the result. The issue starts with the fact that we expected about 300 users total, and quickly surpassed 1000 in 24 hours. This has easily become the largest application either of us have worked on (in terms of unique visitors per day).

So here is the crux of the issue. What is an acceptable ratio of bug reports to users? We are getting some weird reports that we can't reproduce (and I strongly suspect is a result of the unexpected speed of scale), so where is the line between we can write it off as "A billion proverbial monkeys at a billion proverbial typewriters will manage to find an edge case. It happens", versus "This is a chronic issue we need to prioritize".

We would love the input from someone who has experienced this before, as this is entirely new ground for the both of us.