Eh...Some people use parsers for their own personal gain (me), some people use it to help others, some people use it to belittle others. It's the same as being in a position of power. How it's used is dependant on the person in said position.
And as stated before it's pretty useful for raiding for a few reasons. I personally wouldn't mind seeing an in-game parser, but I might be biased since I'm confident with the numbers I pull on my DPS and tank jobs.