When you work in any business, it is important that you maintain relationships with the customers. Whether you are employed by a larger business or running your own business, maintaining a relationship with the customers you interact with is key.
Your customers are what enable your business to grow. They are the people who are supporting your business, spending their money to help your business grow. This is why you want to maintain a relationship with them. This can be through communication or supporting them. You want to ensure you are gaining insight from them into what you can improve with your business, into what they like and dislike.
By having this relationship with your customers you are showing yourself to be a good business owner. You are showing you care. You are showing your customers are the main priority, what they think does matter. This will help people to want to support you more.