Customers have earned the right to be asked to buy if the Sales Associate has done a proper job of assessing their needs and meeting their requirements.
Respect for the Customer
Failure to ask for the sale is disrespectful to the customer, who deserves to be asked if the best product that meets their needs at the proper price will make that person a happy, satisfied customer. People who are given the chance to purchase by asking them to buy will more often purchase than those who are not asked.