I think its possible to overhunt a stand, especially if you're not careful with your scent control. I also think it has to do with the particular spot and the amount of deer that frequent the area. During the pre and rut though, I think you can get away with it a little more because the number of bucks moving around increases and your chances of educating all of them is slim. I have a nature preserve that I have permission to hunt mainly to keep does in check. This I've found is actually harder than hunting a good buck because they really pay attention to detail and are constantly changing the trails they use to stay one step ahead of me.