I would go so far as to say that MOST open source contributions come from developers and companies that also work on proprietary systems. I really do not see a

I would go so far as to say that MOST open source contributions come from developers and companies that also work on proprietary systems. I really do not see a problem with this. There are legitimate business, legal, security, and technical reasons for this. Personally, I open source whenever I can, but much of the work I do would not be feasible in an open source model (highly custom systems, competitive advantage, legal restrictions on code or data, code that would be of little value for anyone but me and my clients, etc.).