So why not make the parser available but only show up on end game extreme fights? Seeing as how that is where the majority of dps checks are it would make logical sense that extreme could have a parser and that "more accessible" content as the poster above said can go parser free.

Lets just be honest for a moment and assume that a lot of end game raiders run the 3rd party tools anyway. If you are not running end game you have almost no use for one.
As a player that came over from WoW as a guild master for 4 years. Skada (a dps/hps parser) was critical to raid leading and seeing where things had to be improved. You get to be the best when you are given the tools to do it.