- You're experimenting - You don't want comments from the peanut gallery while things are in progress - It is not for external use, specific to an institution or project, or otherwise nobody else will care - It deals with something sensitive - You've made an agreement with someone else that requires it - etc. etc. etc.

People seem to have weird notions about nonprofits. Your tax structure doesn't change the fact that you operate in a world of other human beings.