When we only rush 3 Dlinemen against 5 Olinemen, it's unrealistic to expect them to get sacks. That is, unless we have a freak NFL 1st round draft pick like Will McDonald on the Dline, and those guys are pretty rare.
The whole purpose of defense is to prevent the other team from scoring, and every year John Heacock's defense ranks at or near the top of the conference in this statistic. Our sacks typically must come from a blitzing linebacker or secondary, and the beauty of our defense is the QB usually has no idea where our blitz is coming from.
I admit it can be aggravating to watch the other team's QB have all day to throw the ball on certain plays, but he's taking all day because he's staring at 8 pass defenders.
In short, although sacks are fun to watch, they're not a high priority in our defense. Stopping the other team from scoring is.