If you want your business to be successful then your customers should be important. The importance is:
If there is no trust in your product then no customer will come to you. They are not going to spend their earnings on such a company on which they do not have trust. Then if your customers are happy they provide insights into your marketing strategies and also they provide a competitive edge to the company. If your customers have trust in you then it will improve your reputation in the market. So these are some of the reasons.