I expect this will be used as another tool to obfuscate prices. Just like sales tax is effectively a semi-hidden last minute fee in America, I think we are going to start to see all sorts of purchasing method fees at the cash register.

It will start with credit cards but soon it will be for debit cards and there will eventually be a "cash handling" fee if you insist on paying with cash.

These will never be included in the listed prices and they will be just small enough that its not worth it for you to put the items back.