I can't honestly say that they should be "illegal" for many of the reasons already mentioned.
There have always been problems between property owners when one wants to do something that somehow affects his neighber. As long as we can own property, that will probably be an issue.
However, when it comes to hunting, I think a good solution would be to have different record books kept for "high fence" hunts or other means of hunting that restrict the animals free range, possibly even animals on management landand animals taken by "pure" fair chase.
I have no problem with high fence, management property, etc, but I think for the sake of records, they should be differentiated.
Just my thoughts.