I've been an avid Linux user for quite some time. In all that time, I have toyed with making my own distribution, and for me there were many problems. One of those problems was honestly wanting to maintain ownership and control of my code. I felt it would be bad policy to release an OpenSource system that contained a large amount of proprietary code... even if the software remained kostenlos. To that end, I use my code on my own machine, and simply do not release it. Others aren't quite as thoughtful. The distribution that is currently bringing this to mind is Igelle.