It’s one of those tricks you learn in “How to Rip off Travelers 101”: act friendly, provide food or a service and then reveal that you are charging an exorbitant price. The traveler is at a disadvantage because they have already used the service or eaten the food. In general, they will pay all, or at least a major portion, of the price you are asking.
This is what happened to a Dutch couple recently in the Indian state of Bihar. They enjoyed some samosas (spicy, fried dumpling-like snacks), which usually cost well under $1 ($1=49 rupees). When they were finished, the proprietor of the market stall demanded payment of 10,000 rupees (just over $200). He claimed that the samosas were made with rare herbs that were natural aphrodisiacs. After arguing, the couple paid. It was an expensive but valuable lesson, right? Except that the couple went to the local police station and complained. The police made the samosa-maker return the money, except for 10 rupees, the actually price of the snacks.