We have a deer camp with 26 members and we had that problem for awhile. Then we passed a rule that each member was allowed 2 private stands and no one was allowed to hunt them without permission. Each member can have as many stands as he wants but can only have 2 private. Maybe if you put up another stand and really bragged on it they would go hunt it and leave the good one alone. I have no problem telling someone to get out of my stand.