Ye, the higher prices happen from time to time. Villagers are the worst because they don't know good business practices. Having higher prices for tourist is understandable. But villagers are just looking at the skin colour that's the problem. Now that I have an official long term visa I count as a local, of course I will fight it on every turn =) But they also make the prices slightly higher if people don't know each other. So it's just a weird part of their culture. But not everybody is the same! for the most part like 99% of people I meet are really nice a friendly here!