> Costco/Walmart ... There is very little effort made to present the goods, it's all about high volume and the lowest possible price.
I can see that perspective, but it's actually quite wrong. Costco (and similar) put significant effort into buying and presenting high quality goods. Their value proposition is that they don't need on-hand staff with relative expertise trying to match the consumer to product.
A century-plus of data on consumer buying habits have allowed them to engineer an environment where their value proposition is that they are only presenting to the customer good quality for price items. The limited, rotating, selection is Costco (and similar) putting their relative expertise on the shelf and there's tremendous money spent by these companies figuring out how to do this.
The "warehouse" environment is just another method to drive down costs in addition to eliminating pushy salespeople. Costco offers you usually one or two choices for an item, maybe for a few months, then it rotates out. Which one do you buy? It doesn't matter, they're both going to be of reasonable quality and value - a salesperson would try to direct a customer the same way. The stock rotation creates scarcity, but a good salesperson would let the consumer know "this sale is only valid for the next few days!" to create the same sense of urgency.
These companies have huge analytics departments figuring out where the dairy should be in relation to the car batteries, and for how long they should have the special display for fresh shrimp running.
Costco wants consumers to feel like they are getting wholesale prices. But the actual wholesale experience is completely different. Actual wholesale buying experiences are in some ways closer to the traditional buying experience. You're usually dealing with salespeople, hired by the originating company, who try to align you with the long tail of their product offering. Big wholesale markets even advertise that you get to meet salespeople and negotiate buying terms.