Retaining the customers you currently have is something you must not take for granted. Just as employees switch companies, so will your customers if you give them a reason to do so. In fact, often you do not need to give them a reason to leave. The most common reason your customers leave you for an alternative supplier is indifference. It is not that your customers are unhappy with you. It is just that they do not feel strongly whether they do business with you or someone else. If this is your situation, then this makes you vulnerable.