doesitreallymatter, the sign referenced the fact that the cash system was temporarily offline due to the storm (Imelda, which dropped 30-40 inches of rain on that area) and the robot was only accepting credit cards for payment.
You can sign your 5 shares over to Sonata to relieve some of his angst....
BTW, the store manager asked the franchisee who serviced the machine, "What do you put in the yogurt, people just seem to be addicted to it and can't get enough of it", or words to that effect