Wouldn't it be exciting if every prospect that walked into your store or office had an indicator, say something like an LED lamp on their faces, showing how strongly interested they are in buying your product or services? I believe that you will agree with me, that in this way you will not wear yourself out trying to convince someone who has sworn never to patronize you; rather you will save your energies for the real customer. Unfortunately, prospects don’t come with LED indicators that make it easy to distinguish them, so a wise businessman needs to learn what to do so as to maximize the limited number of hours he has each day to make the sales.
Let’s acknowledge from the onset that everyone who comes into your store or office is a likely customer; if not on that day, maybe sometime in future, therefore they must all be treated with the same level of courtesy and professionalism. In addition, someone who never does business with you can send a lot of referrals your way who will make big-ticket purchases and they can also do a lot of damage, badmouthing your business if you treat them poorly.