This is simple: if you offer really good customer service, your customers will keep coming back to your business. They will tell their friends, who will in turn visit your business, and they will tell their friends. This cycle of recommendations results in a business attracting more and more customers simply by word of mouth. Having people recommend your business isn't just a very good feeling; it's very profitable too.
Most small business owners and operators take a lot of pride in what they do. There is no better feeling than having a customer walk up to you and compliment you on the great business you are running. This is the ultimate reward. For that reason, some customers always take the time to offer congratulations to any business that they feel is offering outstanding service. When a business offers poor service, on the other hand, they don't go back, and they also advise everyone they know not to go there.
So, the benefits to you of offering good customer service are that your business will grow by word-of-mouth (free) advertising, you will make more money, and you and your staff will all walk a little taller because you have positive affirmation that you are good at what you do.