[soco]

Points 1-3 are the real investments there and they don't just exist. The other points do indeed exists but with a different workload, which again you could do without. Now the only point forgotten in the other comments is that a small fee, regardless how small, is making the users more responsible - I think at coin-operated shopping carts. But again, you need a level of security anyway, so they could better focus now doing their job: to sort out the disrupters whatever they are - drunks, litterers, vandals.