... over 90% of Koha is done by programmers who work on Koha as a full time job (or two) to put meals on the table.
I'm not sure how true this is anymore. It's a lot larger project now than it was a few years ago. Those same programmers that are putting meals on the table have also put free code back in. The list of the top contributors offers an interesting testimony over time.
The Koha project is larger now in large part due to the growth of Koha support companies like Liblime and BibLibre. As more libraries move to Koha with those companies' help, we're gaining contributors from those libraries. Those contributors, like me, are doing work that is both paid work and contribution: My library pays me to work on Koha (among other things), and the work I do is contributed to the project. But essentially we're working on Koha as part of a paying job. I don't think it accurate to say that there are many people working on Koha for free. -- Owen -- Web Developer Athens County Public Libraries http://www.myacpl.org