Our most powerful instinct is to avoid customer complaints, but they may be the best thing that happens to your business. Here’s why...Marketing research shows that only 1 out 50 unhappy customers take the time to complain... to you. They are likely to let 11 of their friends in on the fact that they are unhappy, but don’t feel comfortable letting you know. What happens to the 49 unhappy customers who don’t complain? Besides griping to 11 friends and family members, they’ll just change products .