You are right, nothing gets my blood pumping like when I find one of these rubs. I'd like to catch a buck working a rub with a game cam, and I know eventually I will do it. Have plenty of bucks, not quite monsters yet, but exciting to have around.

It's important to know that a buck is actively working a rub, as during the normal rutting season a buck, especially a dominant one, will make a bunch of them. 

Often times if a buck works a rub regularly there's a scape nearby.  If you can figure out his travel pattern and can get in fairly close to and remain undetected, you'll have a whale of a shot at him.

Rubs tell you where he is traveling and what time of the day...if the rub is facing a bedding area it was made in the evening when he came out to feed.  If the rub is on the opposite side of the bedding area it was made in the morning when he was coming from feeding to his bed.  And the same goes for rubs located around food sources, if they are on the opposite side of the food source, its a evening route and same side of the tree as the food source, he was leaving the food source to his bed in the morning.   Also the bigger the rub, the bigger the buck.  Big bucks do rub on small trees...but small bucks do not rub on big trees.  Whitetails pattern us easier than we pattern them, but when you lay one down that youve actually hunted and not shot at the feeder, it doesnt matter if its a spike or a 12 point, its a trophy!