Sure,
Well first of all it lets me see if they are working at an appropriate intensity if I can't just eyeball it. Like most of you I think i could guess within a mph or 2 without the gun, but it also gives them feedback. Secondly, I believe it createsan atmospere of competition. Just the other day I was in the middle of a competitive bullpen and one kid hit 88. On the very next pitch the other guy hit 88 as well. they were both getting after it and trying to throw harder than the other guy. Lastly, It helps us to determine the velocity spreads between pitches. One quick note. the first place I got a job was a small 2A. We bought a gun and had one kid throwing 80. the very next year we had 7. We went to the State Tourney. We tried to create an environment of throwing hard. It worked out then..