I've seen what you are speaking of but not in high school ball but in Babe Ruth. IN the B.R. league my son was in there was no way for him to get a tryout in Mickey Mantle. The coach of his team was blatantly showing favoritism and my son and others only got to play when other kids didn't show or if they were needed. The odd part about the Mickey Mantle team was they were winning and with kids I had seen play several times that were not the best players while other kids were not even allowed a tryout even when they requested one. On the B.R. team when no other pitchers were available and the one who was pitching was getting rocked my son was finally brought in. Pitched a one hitter over 5 innings and was told by the coach as they left the field "You Suck". At the final game of the year the coach brought to the game his younger sons who were not on the team and played them while team members sat the bench. I called the league president and informed him my son would not play the following season and why. At the time no one thought it would matter. But the following season most of the team failed to return and they could not field a team. A new coach was brought in and he finally got enough kids to field a team. The new coach seems like a good one and they probably won't have those problems again and the new coach asked my son to play for him several times but he had moved up to a higher competition level and is vary happy with his new team.