Yesterday on Hacker News we received quite a bit of feedback regarding the licensing model for Polychart.js. While we initially thought that a per-developer model is something everyone will be familiar with, the community found it confusing and difficult to manage. So we have moved to a new licensing model.
Polychart.js can now be licensed under a per-domain or per-company license. We continue to offer discounts to startups (as we're one ourself!). We hope that Polychart.js will help developers create better interactive visualizations with less time.
Let us know if you have additional feedback!