XpertMart makes it easy to keep track of your customers' purchases. Focus on your top customers and send them a gift certificate when they've been out of your store for more than a month.
Customer Relationship Management module
XpertMart: Point of Sale and Inventory Control for Retailers
At many high end boutiques, the top 20 or 30 customers can represent as much as 15% of all sales. Your revenue can suffer if just one or two of these regular big-spenders stops going to your store. Perhaps the cashier inadvertently offended one of these customers the last time and they haven't been in your store since.