Here the bears stopped coming to the baits because there was a lot of berries and apples this year. Also most here bait with old out dated sweets that they get from the stores. Some will travel quite a distance to get thier bait for them however. They still will use a lot of grease around the baiting site though. So my question would be is there a lot of berries, apples, or nuts from the oak or beach nut trees? If so that is prolly what had happened to the bears leaving your site.