Just one thing... really!
Don't get me wrong, I like COSTCO. I don't mind the crowds of people there. I don't have a problem with buying a membership that could potentially cost you more than you save, if you only buy bagels and big pizzas. I don't have a problem with their exclusive policy on AMEX or cash.
I like COSTCO. We go almost every weekend and buy at the least, a couple cases of waters.
I hate their shopping carts, though. I don't know if it's the coating on their carts, the floors, or maybe the soles of my shoes (or even a combo of all three). But every 10-20 feet, I get a ridiculous shock from just pushing the cart. I've taken to pushing heavy carts with just my fingers touching the plastic shell on the cart. I'd rather deal with cramped fingers and slow, wide turns than risk getting shocked.
I hate that!
My Ecosystem Details