I bought a license for my commercial project. Also, I have a few non-profit projects for a small audience. A lot of people use nulled version, and if the project grows, buy a license. I don't like this way, and I'm against it. And I have to put phpbb for small projects, because it is expensive to buy a license for each project. Why do not you release a version with some restricts? This would make the engine more popular.