Doesn't look like we use the same definition of "wide enough":
http://c8.alamy.com/comp/CRCY5X/people-at-the-checkout-in-a-...
But even so, why "pass the line"? That's what's usually frowned upon in the rest of the world, not getting out without passing through the cashier line if you haven't bought anything.
>The entry is clearly marked though and it is obvious that it doesn't double as an exit. So arguing that it's different in 99% of the world doesn't score a point.
It's probably more about "you're doing it wrong", get on with the rest of the world.