[Jim Porter]

Our MSBL has a three hit-by-pitches per pitcher per game rule. Hit three batters and you must be replaced.

There are two viable reasons for it. First, guys can get ticked when you hit too many of their batters, which can cause rising tensions. Second, these guys have to go to work Monday morning.

There are pros and cons, but so far in my experience, it's not a bad rule. Ive only had to enforce it two or three times in hundreds and hundreds of games, and the players were very understanding about it when I did.