Apparently, these whiners were dialing in “40 to 50 times as often” as the “average customer,” and after failing to appease them, the firm chose to “terminate the relationship with those customers to allow them to pursue other options.”
Unprofitable customers are parasites. Harvard Business Review estimates that, on average, 15% of all customer are unprofitable. The book, Angel Customers & Demon Customers, estimates that, in most industries, the best 20% of customers account for 150% of profits. The worst 20% typically lose money equal to 75% of profits.