WebWork's (WW) community is made up of users, developers, and bystanders. Each one is important in making WW a success. Users daily use the framework and provide valuable feedback on usuability, bugs, features, etc. Developers contribute their time writing a framework others may use. Bystanders look on watching the work unfold. Some of them will *soon* become users or developers.
This quote taken from http://opensource.org best describes why we spend our time working for free.
"The basic idea behind open source is very simple: When programmers can read, redistribute, and modify the source code for a piece of software, the software evolves. People improve it, people adapt it, people fix bugs. And this can happen at a speed that, if one is used to the slow pace of conventional software development, seems astonishing."
"We in the open source community have learned that this rapid evolutionary process produces better software than the traditional closed model, in which only a very few programmers can see the source and everybody else must blindly use an opaque block of bits."