Unrepresented
Something Borderline Offensive
But you kinda did again...I NEVER ignore the part about the retailer wanting profit!! No profit, no business. Bad.
The retailer's goal is profit.
The customer's goal is product at the lowest possible market price.
Now, admittedly there are complications when there are competing products which may fit the customer's needs more or less effectively, but the basic adversarial relationship remains between the two parties.
Your salesman is employed by the retailer, therefore bias towards meeting the retailers demands will take priority.
You've offered a particular situation where the goals of the customer and the goals of the retailer can become more aligned through the salesperson when the retailer will focus on retaining customers through reputation and customer service, however it is still in the retailer's interest to give the appearance of this relationship while violating it at any time they believe they can get away with it, since, realistically, sales is a credence service. As customers we don't know what the profit margin for the retailer is, and we don't know whether a recommendation really did fit our needs better, short of purchasing all alternative products.
Again, the idealized situation of customer service as a motivator is decreasing in validity as the internet increases the availability for customers to research prices and reviews online. Customer retention is no longer a viable goal for many retailers to expect.