I used to wonder why they didn't just put those things in a staffed display kiosk at the exit, so that people who had given up their nail files at the previous airport could purchase a replacement at the destination for a buck or two, helping pay for the worker to staff the kiosk and giving a more immediate replacement for the implement that was relinquished rather than making the person have to seek out a store in an unfamiliar town where another could be purchased. Bureaucrats - whether they're in government or business or whatever - are too dense to figure out problems ahead of time, let alone solutions to those problems that will head off the possibility of increasing burdens on already overburdened fellow human beings.