I don't get why people stopped doing this. True, the mint put out a "warning," but IME they are not doing anything to enforcing it. I still bring my coins to the helpful silent teller and I am still being thanking for my business. Do you think the mint has a way of tracking that those coins came form me and send me a bill one day?
I highly doubt it. Given that the mint is ran by the government, it make no sense to thing that they are that advanced?