I've never hunted in a high fence before, but I have been inside of one.... Camp Peary (VA not Ohio.. spelled different). High fence is a realative term, you couldn't shoot a bullet from one end of this place to the other at a 45 degree angle... 10s of thousands of acres..... but the dogs, the poachers and the "other" deer are kept out. Its strictly managed and done well. I don't have the politcal swank to hunt on a FBI/CIA training facility, but my godfather does. He took me when I was fairly young, probably 16 in the summer time to help with a deer count (spotlighting and just counting.... no guns involved). I've never seen so many deer in my life. I think the lack of pressure, good nutrition (hundred acre plots of nothing but Bio Logic) and ability to control who and what comes and goes has a lot to do with it. So if you think about it that way..... anyone who has ever hunted on a military installation.... you are guilty of hunting inside a high fence...... hang your heads in shame the lot of you....
Most of the high fence operations that I know of have fences to keep things out.... not neccessarily to keep things in.... so long as the fence isn't playing a part in the hunt, I don't see the issue with it. You can hide a hell of a lot of deer on 1000 acres, nevermind 10,000.
If somebody wants to go shoot a deer in a pen (small inclosed area), hell I don't care go ahead if it makes you feel better. That way you can win the HNI big deer contest and impress all your friends and get your picture on a magazine cover to put in your avatar picture and write something about how big your nuts are in your signature line.