Customer service is very important. That is #1 no matter if it is a walk-in, returning customer it is important to treat every visit like a First impression. Everyone is a potential asset. We need to treat them like we care and respect their choice to continue to come to our business because we put them first. If we get laid back we are then putting a risk to losing not only this customer but all the customers that this customer influences into coming to your business. I enjoy my customers so my first rule of thumb is treat them as special as you want to be treated and you can't go wrong.