lootophobia
(noun) - The fear/phobia of being cheated/looted/treated-unfairly by cab drivers, shopkeepers, police etc. (all public services) when one goes to a new place. By taking advantage of the fact that the person is an outsider and knows nothing about the place.
Say you travel to another country. The fear that the cab driver will charge you more than a person who a stays in that country, because you do not know about that country. This is lootophobia.