Steve McIntyre blogs about why he's working on Debian – where does the motivation come from when all seems uphill.
Read his blog post here
I want to have a good free operating system for me to use, and Debian certainly fits that need.
I'm a bit of a control freak – to make sure that the OS matches what I need, I want to be able to contribute and help direct how things are done. Again, Debian fits that for me.