That markup must be store-/region-dependent. I use it once in a while, for my chain grocer that I have a loyalty card with. You don't get to use the paper coupons they send out once a month for free/deeply discounted stuff you buy often, but when they run in-store specials they advertise in their flyers, like "buy 10 for $1" pantry items or (3) 12-packs of soda for $7, those discounts still apply. Lately, I've been lucky enough to log in and I get free delivery good for the next 24 hours but I'm in a large city, not out in a suburb.
I know a lot of fast food joints have a steep markup from their brick and mortar stores, though.
Lou doesn't care, though, because he doesn't see money the way you or I do. He can only see what he wants, and what it takes to get it. He never minds the fees, etc. unless they can be used to whine about in conjunction with his many grifts: Lou sees thing, he sees numbers, he counts numbers, he begs for additional numbers, then he submits numbers to person with thing. That's it, that's the thought process in its entirety. Money really does grow on trees in Lou's world, and his little Twitter birdies are all he needs to shake down the numbers to get the things.