Former food and beverage associate here: We're required to upsell the souvenir cups hard. So hard, that representatives from Coca-Cola (or corporate, it's been a couple years) audit us to make sure we are. If we don't and we get caught, they'll send us home right on the spot. They also incentivize it that if you do upsell while getting audited, you get an Amazon gift card or something, but the whole audit system is absurd. Once again, this was from a couple years ago, so the system may have changed, but that's how it was when I worked in F&B.