When you make a film, you sign a contract with somebody, and it's not only legally binding but morally binding. You agree to give this man a certain number of weeks of your life, and you just go for it as much as possible. Because, whatever happens, the film is going to come out, so you might as well try very hard to make it a good one.
Exoticism can give you an edge: it makes people assume you're cleverer than you are and gives you the upper hand.
I do a film because I like the story and I want to give life to a character - I don't necessarily have to agree with the director.