What I don't get about this: most people seem to know (think?) this. So you'd think these guys have no income at all because no-one is trusting them so no-one buys from them. Yet after decades they're still there, in a lot of cities. So there must be something which works in this system. I find it hard to believe they survive off the occasional sell to a tourist. I mean, could be, but seems far fatched to me?