There seems to be a lot of negativity in this thread. So, I'll attempt to provide a positive spin.

I think of this (and other open source hardware and software projects) similar to how I think of mathematic theorems or tools at Home Depot. These are good building blocks to learn, prototype and build. If you want to take it commercial, then you have to bear licensing costs etc. but it is a great way for hobbyists to build things on top of these blocks rather than start from scratch.