I watched a woman "chat up" the clerk while her husband filled his pockets with the impulse buy items that surround a cash register...batteries, small gadgets...rather pricey stuff.
I called the manager over and told him what had happened with this long gone customer. We discussed the disadvantage of having high priced, small objects in that area. He summed it up with "We have confuigured our pricing to reflect shoplifting" and even when they do catch them they usually let them go. No big effort on their part however.