Good question... Wish there was a Good answer...
Poor training in the first instance springs immediately to mind, but there again to tell people what to do these days is probably against their Human Rights !
Over enthusiastic Health and Safety regulations demanded the gloves in the first place, but be assured the wearing of them is not for your protection but the shops. (Saves them from prosicution for non compliance).
Most Health and Safety enforcers would be content to see the staff wearing gloves without noticing what they were doing while wearing them.
The person handling the money should not be involved in handling food, but that's one more member of staff to be paid for out of sales.... So the price will be higher.
Customers bitch about cost so corners are cut to keep them down, pay peanuts you can only employ monkeys...
We can't have it all ways.
Trouble is if we worry too much about it it will drive us mad, just imagine what goes on that we dont' see....!