Ok lets say all that is so and lets say somebody, maybe these guys have done their home work and not just any sound produced is the ultimate sound that deer can't resist. It's not to far of a reach since calls and scents use the same arguement.

If it's the person, the bag could be just as good as the real.

Too much doesn't always mess it up if you know the deer your after. A buddy went after a buck that was one bad dude, it took some very aggresive work to get his anger up. He knew the deer was aggresive because of the way it was ripping things up.

Family people, his dad watched the buck from a road while the thing sat in a ditch although neither had planned it that way. I think he said it took over an hour. The buddy had his nephew along, itwas his first.The buck came crashing in ready to kill as they hid behind a huge tree.

He whispered to the kid to peak around the tree when all was quite and see were it was. The kids eyes were hugeand the folowing convy took place;

"He's right there!"
"Where?"
"Right behind the tree!".

The guy started to look and saw nothing but bone, right there. 3 feet away. The buck went into a frenzy and took off. The kid went to shoot but was stopped, "We don't shoot at running deer" was the reason given.

I think deer are attracted to a new one in their area. Many have said that using crap from another area attracks deer, I agree. A different sound maybe the same. That wouldn't rule out the bag at all. On the other hand a familar sound, wouldn't spook them either so a shed from the same place might work very well and could be the reason for somes success.