Yes it does. Same reason a Mack Truck weighs more than a F150.
3-9s have more parts to break and everyone with a brain sets them at 4X and doesn't change it. As far as weight goes, almost all of us could drop 10 pounds off our gut and be better off, rather than worry about ounces of scope weight.
You can kill any big game animal, anywhere with a 4X IOR and then drive in your tent stakes with it.
Now if an IOR isn't rugged enough for you, go to
http://kalinkaoptics.com/Those who know, know where the Zeiss factory ended up after WWII. With these you don't need a finishing shot, you can beat the bear to death. (stick with the Mil-Spec models).