I, too....er..."WE" are happy Costco customers, as well. But, did you ever notice how Costco seems to be bordering on "cultish" behavior...? I mean in one visit to my local Costco...after first proving I'm a "cult" member...I can buy batteries, digital cameras, TV's, get my film developed, buy kitchenware, buy printer cartridges, tools, motor
oil, car care supplies, crab legs, pastries, bread, meats - prepared and fresh cut, produce, any kind of drink - including beers, both import and domestic, furniture, lawn equipment, books, frozen food - of any kind, dishwashing soap, coffee, tea, milk, cleaning products for the home, kitchen, and bathroom, toilet paper, paper towels, paper plates, toothpicks, napkins, t-shirts, toys, bicycles, basketballs, golf clubs, hats, blue jeans, shoes, socks, belts, underwear, dress shirts, coats and sweaters, flip-flops, snack foods, prescriptions, OTC drugs, deodorant, shampoo, cigarettes, cigars, and too many other things I know I've missed....
Then....on the way out you can refinance your house, order a car, buy some tires, make a home loan (first or second mortage, thank you), buy storm windows, siding, or a roof, arrange a cruise, make travel arrangements to any country, buy insurance...home, health, life, and auto, get investment advice, and get a hotdog, Polish sausage, pizza, soft pretzel, ice cream or a smoothie.
Finally, after you've returned to your car from your safari through the Costco jungle, on your way out of the parking lot you can fill up your car, or get your
oil changed.
DAAA-YUM...if this isn't a "cult" what is...? 
What's next...medical and dental care?