I try to end the game as soon as I can, anything can happen in h.s. baseball.
As an example, last season we were up on team by 9 runs after 5. The opposing coach wanted to know if we wanted to call it (they are from a neighboring state that plays an 8 run rule). I suggested we continue, saying something like "the way your guys hit, coach, you're never out of it". Sure enough, they came back and beat us....and the team I was coaching won 30 games last season!
That's why I always stay agressive until I have no doubt it's over. To me there is absolutely no shame in sac bunting or stealing the game-ending/winning run into scoring position.
But I will admit there is a fine line between assuring yourself a win and running it up. I think it was Bobby Bowden that told Lou Holtz once.."Coach, it's not my job to keep my guys out of your end zone!".