For any business, online or otherwise, a solid marketing plan is a key factor in how successful that business is. Regardless of whether one owns a trading card store, an eBay online shop for sporting goods, or a bookstore, getting the word out about a business is critical. If customers don’t hear about a business’ unique products, services, and offerings, they will never visit the business. No customers mean no purchases, which means no profits, which ultimately means bankruptcy.