It just doesn't cost that much to provide it, and what you get for it is valuable customer loyalty. Also, consider word of mouth advertising, and referral business. This is one of the most important and most neglected parts of small business ownership. Sales, or lack of, will make or break you. It is amazing that so many people doing sales for a living, professional communicators, fail to train or improve their sales skills.
Human resources are always the most valuable resources a company has.
It's doubly important in the sales department. That is why it is so important to be effective and productive with your sales efforts. In some ways, this management task is the most boring. In some ways, it's also the most important. Entrepreneurs are starters and frequently make poor managers.