In Korea, the Line 1 Subway has a nickname, the ‘shopping line’. This is because you get all kinds of people selling things from carts. Stuff from band-aids to steamed corn. You could literally ride the subway all day and probably get all your shopping done for the week. On the hypocrisy side, the LCD displays that run commercials, run one for people saying ‘no’ to sellers and includes a reporting phone number. Yet they continually sell stuff all the time. I suspect it’s one of those ‘it’s only illegal when there is a problem, then we get to fine you.’.