Interesting read here:
http://www.sbnation.com/longfo...rofile-perry-husband
States that pitching inside adds to the effective velocity of the pitch and it states low and away is easier to hit than up and inside.
My kid LOVES to throw inside and basically has little to no regard for the hitter. He knows that to be successful, he has to establish his plate and work from there. He does hit guys unintentionally and then deals with them via his pick off move.
Follow up with more data: