This is a tough one. Obviously you wouldn't be running your first team after about 4 goals, but the backups want to play and they want to score. Pulling the GK to a forward position does nothing but motivate the rest of the team to assist them in getting a goal. Playing "keep away" is just as humiliating to the opposing team as running up the score. Why not have a slaughter (mercy) rule? After 10, the game is over. To intentionally allow another team to score to avoid shutting them out proves nothing. No one likes these types of games. There should a limit and then the game is over.
