Big corporations' ineffeciency is also caused by this:
Departments that are not profitable can survive. If they were separate companies they would go bacckrupt. The free market "Only the fittest survive" motto doesn't apply to them. This is also the main reason why most state-run oranizations are ineffecient.
When users downvote a comment, they should be required to give a reason. When someone downvotes me, I wonder why that is: Am I too arrogant? Do they just disagree? Is it because what I posted is obvious? This would also motivate people to think about downvoting more and reduce the problem with interesting comments being downvoted because people disagree with them.
Or they have a quota for losses per day.