That is the one interesting thing about the Dominion that made them different from other villains is that they dont hesitate to sacrifice ships either to send a message or to defeat an enemy.
But the Borg do it too. They sacrificed an entire cube to protect Voyager--because it had something they wanted.
They sacrifice drones all the time.
They pretty much have the same attitude towards their drones as the Founders do about the Jem Hadar--and anybody else that's not a changeling.