“McDonalds? Haven’t they served like 50 trillion people and counting from all over the 
world… or some ridiculous number like that?”
247 billion is the actual number, still impressive. Since there are only around 7 billion people in the world on average each person eats at McDonalds about 35 times. Of course not everybody eats at McDonalds, so of the customers who do regularly eat at McDonalds the number is likely quite a bit higher than 35 times.
The point is McDonalds doesn’t really need new customers, not like you need new customers. So why go local?