Networking vs Selling

"Don't make the mistake of networking with people you want to do business with. That's not networking; that's selling. "The best people to keep in touch with are the ones with whom you are already doing business -- namely your customers, clients, and suppliers. If you make it a point to stay in touch with customers and clients about matters that concern them, it's almost inevitable that over time they will be curious about matters that concern you. They'll volunteer to help you. That is the essence of effective networking: People helping you out whether or not there's anything in it for them." Source: "Never Wrestle with a Pig" by Mark H. McCormack