For those who use more than 10 power scopes, do you feel they give you an advantage?
Yes , the scope which works for the sniper is not the same thing that will be used by a target benchrest shooter or varminter. The sniper is shooting at a far larger target than a prairie dog hunter. I doubt you will see any 10X scopes used in setting world records in target benchrest.
For deer hunting I would say the vast majority of hunters are not taking shots over 100 yards and the 10 power or higher is not needed and deer are massive targets in compairison to varmints.