Godin's first law of pizza
Saying yes to every prospect and every request isn't the point of most organizations. The point is to do work that people seek out, that changes things for the better, to bring ideas that spread to the world.
Some of the legendary families that serve great pizza in New York aren't in the customer service business. They're in the great pizza business.
Saying yes to every request is one way to do business, but it's not the only way.