Quote Originally Posted by MythToken View Post
it would let you know how much dps you are personally doing on a fight. You could test yourself on a dummy and improve your rotations based on that number. You could improve your strategy on a given fight adn do more dps. It would absolutely be valuable to know your own dps.
Having everyone see everyone's dps allows you to see how you did compared to others. If an equally geared dps is doing much lower than the other dps then that dps can see that he needs to improve.

If you only see your numbers you may never know how much better you can actually do. Say a person does not know the optimal way to play their dps class and after a boss fight they see their dps was 250 while an equally geared dps should be able to push 400+ easily. That person won't know that and think he is doing fine when he is actually not. Other people in the group won't know who is dragging them down in a fight also which can be a problem unless they see everyone's dps.