They also don't sell brake parts, that's how confident they are their shoppers roll through stop signs, run red lights, make illegal u-turns, and generally fail to yield to the non-Costco class.
Source: I frequent businesses that share a road with Costco and it's a given that if there's Costco traffic there's gonna be some shit.
Costco doesn't sell chocolate ice cream, that's how confident they are about their vanilla ice cream.
Pretty arrogant.
It's pretty good though, especially when it's swimming in root beer.