What is the highest you will go ( have hunted ) in a tree stand. Is there a minimum height you will hunt from before you consider the stand useless?

I'm talking climbing and hang on stands.... not towers.

I usually hunt at about 20-25 ft. But I will relate this story to you all. Here in Arkansas we have a mountain called Mt. Nebo. My cousins belonged to a deer club that leased land on the side of the mountain. They invited me to hunt with them one year and upon arriving at camp they immediately took me out so I could put my ol' man climber on a tree, mark it with my GPS and find my way to it in the dark the next morning. I picked out a tree on top of a ridge, marked the location, and we left. They dropped me off the next a.m., still dark, and I made my way to my climber. I got settled in and started climbing and stopped when I figured I was high enough. Imagine my suprise when the sun began to rise and I am almost in the clouds. I had, in the pitch dark, underestimated the rate at which I was climbing. I was dang near 50 feet above the ground. I had deer milling around directly under my tree. I was so high that when my cousins came to get me, I kept my mouth shut, and they thought they were in the wrong spot and left to go find me.LOL BTW. yes, it did scare the bejezzes out of me initially.