Not everybody is doing it and it does create an unlevel playing field.
Using pine is just fine – The Daily Evergreen
Brandon Kintzler loves MLB's sticky-substance ban and says some
This Is Being Called One Of The Best Catches In Cricket History
In wake of Michael Pineda ejection, MLB should legalize pine tar
Should Pine Tar Be Legal for Pitchers?
Why do baseball players use pine tar?
Sticky fingers means they're out
Why Pitchers Use Pine Tar
Chris Welsh says Chris Archer used pine tar on jersey for some pitches
Pitchers' guide to cheating: How to do it right
The History of Pine Tar in Baseball