Most of my friends here do not shop at Costco. In Anchorage EVERYBODY shopped there!!! In SoCal too.
Perhaps it’s because Costco originated on the West Coast and have had more time to develop brand loyalty there.
Costco was founded by some guys who worked for the original membership club company, Price Club. The 2 companies merged in 1993. Most people don’t realize that Costco is now the second largest retailer in the USA and 3rd largest in the world with sales of $112.64 BILLION Dollars! Walmart is #1.