This will probably save me about a month of work. This is the power and freedom of truely free software. A few of the more prominent people in the community have bought that claim. Even Richard Stallman has accepted some of these licenses. The main purpose of free software is, as the name says, freedom.
Economic efficiency is a secondary, but still important, aspect of free software.
Both of those are limited by patchwork. I'm no longer free to use other people's code in other projects. If the Linux kernel and fftw were under patchwork, I would no longer be free to borrow bits of their code to do my research. As such, I loose freedom, as well as time. I am forced to reinvent the wheel.