I always oil mine. Like you said, to keep them from sticking to the bag. Clean out an old paint can and when you have lures ready to bag, toss them in the can and put a few drops of oil on them and mix them around. Found its easier than trying to squish them around in the bag to coat them. Next time, there is usually enough residual oil in the can for another batch. This seems to make the oil last longer and keeps from getting too much in a bag.