I tend to support the Boone and Crockett rules on this:
For the purpose of entry into the Boone and Crockett Clubs® records, North American big game harvested by the use of the following methods or under the following conditions are ineligible:
I. Spotting or herding game from the air, followed by landing in its vicinity for the purpose of pursuit and shooting;
II. Herding or chasing with the aid of any motorized equipment;
III. Use of electronic communication devices, artificial lighting, or electronic light intensifying devices;
IV. Confined by artificial barriers, including escape-proof fenced enclosures;
V. Transplanted for the purpose of commercial shooting;
VI. By the use of traps or pharmaceuticals;
VII. While swimming, helpless in deep snow, or helpless in any other natural or artificial medium;
VIII. On another hunters license;
IX. Not in full compliance with the game laws or regulations of the federal government or of any state, province, territory, or tribal council on reservations or tribal lands;
Found at
http://www.boone-crockett.org/bgRecords/records_affidavit.asp?area=bgRecordsI also think that the ethics statement, "Behave in a way that will bring no dishonor to either the hunter, the hunted, or the environment." also comes into play with high fence hunts. I tend to believe that high fence hunts are the biggest risk to our hunting heritage of anything else the antis can find.
That being said, as long as it's legal, i'm not going to try and stop someone from doing what they think is fun. If they think shooting a big dumb buffalo in a pen is fun, well, this is America...