Breaking Out

I am sure everyone has done this in the past or even now. I know I am guilty a few times.

What is your opinion on Breaking Cards out of the holders after grading or buying graded

All the recent buying of cards for me and some of them just for the backs has really gotten me into the POP reports like never before. I know that not every card is still slabbed but do you think this is going to damage the hobby?? If you think there are more than there really is won't that decrease the value of those cards??? I would also think that without dead accurate POP's that it is alot harder to determine SP's and Values.

I am interested in hearing what you guys/gals have to say about this.