They know that once they have established a relationship, their product or service is no longer thought of as a commodity. Businesses that offer commodities often lose customers due to competitors offering lower prices. Businesses that form warm relationships transcend being thought of as a commodity and maintain their customer relationships with service and constant contact. No wonder they don't lose business so readily. People want relationships, want the businesses they patronize to stay in contact, want to feel cared for and not ignored.
All guerrillas know that their customer relationships are their most precious assets.
They know that if customers purchased from them one time and had an enjoyable purchase experience, they are very likely to buy from them again. And again and again. And to provide many referrals over time. They contact customers within a month of the sale to make certain they are satisfied and have no questions. They get in touch with customers once again three months after the sale, this time suggesting new items that may tie-in with the original purchase.