There isn't a need for deception on a sac bunt. The whole ballpark can know its coming, if you get the bunt down it doesn't make any difference. If you know it's coming, then the success rate goes down. Based on what? If a player gets the bunt down anywhere towards the third base line there isn't a thing they can do about it. Because Rolen and Pujols will be closer and more likely to make a play on it. Of course if he does it right there's nothing they can do about it, same way if Floyd hit that curveball over the wall there isn't anything they can do about it. If the defense knows you're bunting, it cuts into the margin for error the bunter has.