UPS not ringing bell, ever

Does anyone know why UPS has stopped ringing the bell when they deliver packages? I'm getting kind of sick of it. We have at least 10-20 packages delivered a week and they never, ever ring the bell, they just throw them on the porch and run. They can't give me the excuse that I didn't hear the bell, because I can literally hear them throwing the packages onto the porch, heck can here the truck pull up and the truck door slide open. A lot of people walk by our house on the way home from either school or work, and I'm worried that eventually we're going to be classified as an easy target; you know the house that always has stuff on the porch. I asked them on facebook, but it was instantly deleted. Anyone here know anything about this change in policy, is the office simply asking too many delivers of any given driver in any given day? They just left 5, yup 5 packages on our porch, without a ring, and we have a foyer for geez sakes. Thoughts?