It also uses the cheap food trick ($1.50 hot dog, $5 rotisserie chicken) as well.
I tell myself I am going to run in and get one thing, but I come out with my shopping cart full.
Because Costco changes what they carry on a regular basis as well as the promotions, whenever you see a sale, you want to immediately grab a bunch of stuff.
Also add its super friendly return policies and you are thinking “If I don’t like it, I can always just bring it back”.