I know your point is they don’t do it more than department stores do, and you might very well be right. I think it is probably hard to prove either way.
https://www.e-architect.com/articles/the-psychology-behind-c...
I think there's at least a difference of degree, but I think it's more than that.
This is different from a casino, where the most likely thing you'll do if loitering is to sit at a table or machine and gamble more.
Source: "Addiction by Design: Machine Gambling in Las Vegas" by Schüll
https://www.amazon.com/Addiction-Design-Machine-Gambling-Veg...
People used to think we pumped oxygen into the casino too. It would be a fire hazard, and expensive to buy oxygen and maintain such a system. The casino where I worked for 13 years was so cheap they took away the kleenex from the staff locker room, downgraded the toilet paper, cut out staff parties.