That question about customer service is very important. Actually everybody works something in order to make selling to customers and earn money. If you do not have customers, your business doesn't worth, because you will not be able to earn money. Therefore, the main goal should be to pay attention on customers. Question is not only how to get new clients/customers, but how to keep them and motivate them to come to you back. That's definitely not easy task, but with good customer service, results could be very good.