Question on Betting Sacks

I made a bet on UNDER in this Cards-Rams game and put a total sacks over 5.5 side-bet along with it. Now here's my question, since there were only three sacks and I analyze the hell out of my KO bets, how bad of a bet was it?

Now when everything is said and done, it seems crystal clear Cards would go in with the gameplan of getting rid of the ball quickly and rather have little to no gain, than to lose yardage - because hey, they have a good defense to back them up in case they have to punt. So my questions are:

1) is it a bad idea to go with these side-bets on heavily defensive (from both teams) games? From your experience, are there lack of sacks in games that are expected to be a grind?

2) does it even make sense to combo UNDER with this? it's kinda similar bet after all - you trust the D (no pun intended)

Thank you for your input.

You made a bet without knowing whether there are alot of sacks in games ?

 Your asking that question after the game ?

You should of ask it before the game then went and did your homework then decided if you had any value in this particular game.

You made the big mistake of trying to apply your common sense to the bet instead of applying research and actual facts of how games play-out.

Good Luck to you...................................... 

I did research regarding how these teams play lately - though I did not look into how defensive grind fests in general work out, that's true. But, among other things, there were 9 sacks in the last meeting. I was asking if it's common at all, that defensive grinds (more importantly, EXPECTED defensive grinds) end up with lack of sacks, or was there the 'both QBs got wasted in that game, lets look into that before rematch' factor. I'm sure it's common sense for you, but I'm not exactly seasoned in the sport, so any pointers would be great...

...or just be arrogant, that works too. I guess I can take 'learn the hard way' as a pointer enough. Thanks none the less and have a wonderful weekend.