I love seeing open source projects developing a "Pro" version. I've been using Sidekiq Pro for a long time now and I know for sure it won't be as heavily maintained as it is without the Pro option.

As far as Gor goes, when you develop a new feature, it's a really powerful tool to pass some of the production traffic to staging to see how the new feature reacts with real world traffic. It's a sure way to find bugs you usually miss with testing.