Very good. There are a lot of mall walkers who don't buy anything, just take advantage of the large indoor space and its climate control. And much like the "network effect" people like to talk about, malls don't want to be empty. They would rather be full of non-shoppers than 1/10th full of customers, because perception is everything. If no one is at the mall, why would businesses come to the mall?
Shoppers aren't the mall's customers, businesses are. The mall doesn't care about the customers, they care about luring businesses to locate there and pay rent. And if they have a ton of non-shoppers loitering around, that makes their mall more attractive, not less.