The only yard I keep a fence around is at my home, which is located in a subdivision. It's a white PVC picket fence that obviously isn't there to keep anything in and wouldn't likely keep anything out. It is however a friendly sign that says keep out to passers by, without the need for alarming "Warning" signs around. It also adds a little appeal to the 20 or 30 hives in a development that would normally just be a pile of boxes sitting in the yard.
My stands are built in such a way that small animals aren't a problem at any location. And since bear is a rare occurence in the GA piedmont, I think it would be much more cost effective to replace a dozen hives once every 20 years than it would be to try to maintain a fort around them.
Everyone has their problems where ever they may be and plan accordingly.
"Success is not final, failure is not fatal: it is the courage to continue that counts." Winston Churchill