Nearly every company has a group of best customers or clients: those people who are intensely loyal and use more of what you sell or use it more often. In addition to being more profitable, these customers may hold the key to growing faster. If you spend time with these “enthusiasts,” you can learn why they tend to buy more — or more often — and use those insights to market more effectively. So find your biggest fans, then bring them into your brand. You’ll learn a lot in a short time.