I've been seeing them pop up on my place. I find them in the same places every year. Next week I'm planning on putting a few cameras on them to see what's in the area. What I've seen from prior cameras is that they seem to hit them the most between 10 & 1, but the same birds don't hit them everyday, with some days not being hit at all. I don't think it has anything to do with breeding. I rarely get pic's of gobblers and hens using them at the same time.
Also, when I'm not sure of where to go, I will sit by them until I make up my mind. I've seen hens come while I was sitting over them, but have never shot a tom using one.