I think the rules against grip substances is kind of silly. It evolved due to pitchers trying to blacken the ball (mudballs) so that batters couldnt see it. Someone got killed and they made a rule, no more foreign substances. Well, now pitchers get a new ball every couple of pitches, so there is no danger of them being mudballs. At the same time, I hate cheating or even bending rules, so I hope everyone currently using the stuff gets caught. still should change the rule though.