That sort of saving seems a bit ridiculous. Paying $10 for $1000 worth of groceries is insane.
I also wonder when some of these people will end up on Hoarders. I know that when laundry detergent goes on sale, we buy 2-4 jugs, not 50. Sure, we buy the big pack of toilet paper, but not 10 of them. And buying cat treats when you don't have a cat is nuts.
We can't even get close to that kind of savings in Canada. Most coupons are 1 per costumer, so you can usually only buy 1 of each item at a time. Most coupons are size restricted, so you can't put it toward and size of the item. Even with sales (no coupon needed), there are limits on how many you can buy, like limit 10 for that price and after that the price is higher.
There are some items that I avoid buying unless they are on sale and sales can influence what I buy for some things. I don't buy months worth of it though, it can be a couple weeks if it is something I use a lot and is at a good price.
I don't seek out coupons either. If there is one on an item I already use, then I will use it but I don't go through all the flyers and the internet to find them.