“Zach Nies suggests going even further, segmenting customers into three groups. “‘A customers’ are your really big customers who negotiated a big discount and expect the world from you. ‘B customers’ are customers who are fairly low maintenance, didn’t get a big discount, see themselves as partners with you, and provide useful insights. ‘C customers’ cause trouble, are a pain to deal with, and demand things from you that you feel will damage your business,” he explains. “Don’t spend too much time on the A’s—they sound good but aren’t the best for your business. Bring as many Bs on as customers as possible. And try to get your ‘C customers’ to be customers of your competitors.”