I'm reminded of a family friend telling me a story about how last year they were on day trip somewhere and a power outage happened to occur in whatever one-shop town out in the boondocks they were visiting and only one old Grandma had cash to pay for a drink or snack while the power was out, everyone else basically had to starve through lunch waiting for the power to come back on.
So, even if you had cash, they couldn't take it.