Perhaps when it was a much newer concept (10 years ago),
Wasn't even a new concept 10 years ago. I remember 20-25 years ago as a kid my family would go to Sam's Club to buy all kinds of random shit. It was basically the exact same thing as Costco, with a membership card required for entry, big warehouse building, buying everything in bulk, etc. I feel like Sam's Club had even more variety than Costco does, honestly. I used to love walking by the auto parts aisles and smelling the fresh rubber smell from the stacks and stacks of new tires. :-P
Here in Portland Costco has been around forever ---