There’s a parable available here. You have to invest in people in order to reap a harvest of sales.
People will care more about how you treat them and your service than they will about what you are selling. Until they try the best brand of herbs (according to lab and science tests) called Nature’s Sunshine Products and they get better results.
Then they have sold themselves on how good your product is working. But you still need to go that extra mile in the service department. Because they are not just buying a product they are getting a service.