^^ You guys are probably just shooting (or hunting) out to 50 yds or so, right? Thought so.
If you are shooting at any real distances you would have to close your eye as it is unfocused and useless, while your other eye acquires the target through the scope. Sure, leave it open if you want but it is not doing anything useful.
Nope, longest I have taken something with both eyes open was a coyote at 230m.
It is way easier to track a moving target a range with both open.
Shawn