I doubt that what you do slows the process down by a significant margin. like you said, what else do you do with the loose change except maybe dump it in one of those questionable charity boxes?
at any rate, other customers hold up the line in the Seven. paying with wonky cards, stuffing around with showing their membership card, topping up their SIM card but forgetting their bloody number*
pointless worrying about it, it's way she goes. jai yen yen and all that.
*guilty as charged Your Majesty ????