Someone who maintains an event space will find that they have to do the same tasks every day and that their hard-fought progress is often destroyed by the very events that they host; meanwhile, even their optimized routines will randomly become obsolete due to changing circumstance of construction, government, and behavior... and yet I don't think it would be fair that they are producing nothing of intrinsic value: the value of Facebook isn't the software you developed while working there, but (as they like to say) "the friends we made along the way".