I like Costco because I can buy in bulk and be set for a while, and make fewer shopping trips.
Me too, though it took some time before I figured out how to properly transport and store a 55 gallon drum of mayonnaise. FWIW, guys like COSTCO because shopping at COSTCO is right up there with shopping at Home Depot in terms of generating justification for dropping $40K to buy that new truck.
"Gee, honey, I know ya like that beautiful cedar wood gazebo, but we just don't have any way to get it home. Now, if I had a new truck..."