The seller has got the opportunity to tell to many people. It is for him to bring a light, but, above all, that this light lasts. With the ability to serve others, he can bring loyal customers to his business.
If the salesperson is interested in the common good1, he can bring that is missing to the customers. He knows his field well and brings the necessary goods to the people
If the commercial wants to sell products or services that are not really useful to his prospect or customer, it is "traffic", since it sells superfluous. In this case, it is even worse than the increase of price differences, since it loses the labor saving, while creating a service or product that will be put in the trash. In addition he will probably lose his client.