Glass fronts offer a greater sense of perceived value
Service and price will only guarantee success if you have quality products. The customer has to have a perceived value before making a purchase. Their expectation must be satisfied for repeat business.
Variety with quality products are a must. "Lowering the quality to save on margin is like stopping a clock to save on time." In my own business, these lessons are tried and true. Developing the right product mix is essential in this industry, and decisions must be made with this in mind.
 
  Variety always attracts the customer.