Lots of good points. However, regarding that only reason not to share - that primary differentiator which allows competition to overtake you. In many cases it'

Lots of good points. However, regarding that only reason not to share - that primary differentiator which allows competition to overtake you. In many cases it's all there is. When you start company, or a project, and - as it is in many cases - you're trying to find that one thing which you can present better than anybody - you only have that one thing. It's the reason you hope to survive and thrive. Do you think it's a good idea to open source it? If yes, why?