Those traits are desirable, but not essential for most of our users. I still maintain that rejecting ALL proprietary software is a fundamentalist position. The purpose of software is to do a job - to add value on your behalf or on behalf of a company. Although a FLOSS philosophy should factor into the equation when choosing software, it is unlikely that it should be the primary consideration (although there are cases where it could be). If you simply rule out proprietary software on principle, you are doing your company or yourself a disservice. You are failing to extract the best 'work done' from yourself or your colleagues because of an ideology. Hence the use of the word 'fundamentalist'.

I do understand that by being closed source, our software lacks the desirable properties you have mentioned. But we have not been able to find an open source model that makes financial sense for our company.