extra traffic to and from to fill and check cameras, the unnatural sound of sheet metal slinging corn, the fact that the food is always there so no need to show up in daylight. mature bucks are strange I've killed 130-140 class deer I've only had one or two pictures of and they were never at a feeder the younger bucks they ran with were all summer but the biguns almost have a 6th sense they were always 50 yards away and never at the feeder.