I have taken a road somewhere between FOSS and paid software. I have a data management system that has been in a 'free open beta' for a few years now. Anyone can download it and try it for free.

Right now it can be used as a great tool or analyzing data. Feedback is appreciated but not expected. I try to respond to bug fixes and feature requests in a timely manner, but I am not required to do that.

If it catches on, I might charge something like $10 for an individual lifetime license. Businesses might be on some kind of subscription.