Yes, I agree with what you say. I actually think the dual-licencing model seems the most realistic for many developers who are selling to a business. Ironicall

Yes, I agree with what you say. I actually think the dual-licencing model seems the most realistic for many developers who are selling to a business. Ironically, it's because a strong copyleft licence like the GPL is unattractive to many businesses that they naturally turn to the commercial licence which allows them to make changes they don't need to release publicly. I'm sympathetic to what Fair Source is trying to do, but even that garnered a lot of negative reaction among developers (at least if you read the discussion on Hacker News).