Your customers expect you to solve their problem
The most basic expectation that any customer has of your business is that you will solve their problem. If you're a grocery store, they expect you'll have groceries. If you're a restaurant, they expect you to have food.
Are you solving your customer's problems?
Are your systems aligned to ensure that you don't run out of product at the wrong time? Is your shipping speed sufficient to compete with other companies and is your quality the same or better?
The value of a customer
What is the lifetime value of your customers? Some fast food restaurants have estimated that each customer is worth $4600. Ski resorts say that the cumulative effect of a lost customer every day over the course of a ski season is millions of dollars. What is the lifetime value of your customers?