Creating commercial licensed modules?

[diogo]

The only concern I would have is if possible improvements to processwire often or only start to become paid modules instead of something that could be made a part of or an improvement to the processwire core.

Agree with this. Fortunately Ryan is a sensible person and charges only for features that have very specific uses, I don't think he will ever decide to make commercial something that should belong to the core. I'm convinced that the same would happen with most of the people that dedicate to PW.