Your customers are by far the most important people interested in your business. They are more important than yourself, your investors and your employees.
Unless you serve your customers and fully satisfy their needs, your investors, employees, and even yourself, will not be served, because your business will be nothing without its customers.
Customers vote with their feet and their wallets. The primary goal of your business is to deliver an experience every time your customers visit so that they have no reason to move their affections elsewhere. The experience must be relevant, timely, suitably personal, of value to the customer, and meet or exceed expectations.
And that must be the number one goal of your business, or it wont survive and no-one will be satisfied.