I agree, I killed 7 large hogs in one week from the same little stand with my recurve. I've killed them back to back many times like that. I had taken a mineral block and buried it about 6" deep and put Karo syrup and corn on top of it. There were blood trails every which way leading from that block. There was one large boar that would not come all the way in later in that week but he still got too close.
Many people don't realize it but hogs are actually attracted to diesel fuel, burnt oil, creosote, and the newer chemicals like those used to treat the bottom of light poles. They rub on the poles or chemical saturated areas to kill lice, mites, skin irritations, and other external parasites. How they know to do this or why they have that instinct I have no idea. My dad would always use balsam or myrrh, turpentine, diesel fuel, or kerosene on cuts on hogs and on me so I'm no stranger to home remedies, good or bad. Crazy thing is they worked. Hogs will frequent posts with a rubbing sock on it saturated with these materials and use them much like a domestic hog or cow in a pasture will. We would use wicks like this for cows with certain livestock treatments and many, many moons ago we would rig a post with a pieces of saturated fire hose nailed to them in the hog houses that we could pour burnt oil or medication on for the hogs to rub. They would wear those poles out.
Please don't misunderstand, I'm not advocating going into the woods and pouring diesel fuel or burnt oil or other chemicals on the ground. But hogs do use chemical treated light poles and posts as rubs. There are ways to accomplish doing this without doing damage to the environment or soil but you have to use your noggin a little to figure them out.