Many people including myself shop at whichever sells the food that we find the tastiest without caring for what shop it actually is. I imagine a lot more people do exactly the same or just go to whichever is closest because they're too lazy to venture further to the one they'd otherwise go to.
Exactly. I am just as likely to shop at Aldi as Sainsburys. Funnily enough my local Sainsburys was full of scummy people yesterday. Made me mutter into my in store latte...