One of the best tactics to succeed in any business is having a good customer service. A woman selling things around my house recently started losing customers due to her bad treatment to her customers and now that she has a competitor, many attention shifted to the new trader...
If they aren't treated well as staff, how can they be expected to treat customers better?
This and more might the factors affecting their services but it shouldn't be. Sometimes, these staff get favour from clients just by being nice randomly to customers