I go to other stores and pay more for many things. Wally world gets to the cheapest prices by cutting quality. They order items with inferior materials so they don’t last as long. Some things are ok but you need to be careful.
Besides that, one also pays for service and knowledge. I used to live where I had a large, locally owned Ace Hardware store. Some of the stuff was not as low priced as WM. But when I went in there, they had what I wanted! And the people there knew so much more about a lot of the products. What I received in service, know how and product availability was certainly worth 10-15%. And often, there was no appreciable difference.
You ever drive through city traffic to WM, park in a giant lot and walk to a giant store, where your goal is located in the farthest nether reaches of the huge building; only to discover that they don't have what you want? And there isn't anyone that knows anything about it? Everything comes with a price. Even cheaper goods.