Would it be legal to have a vending machine which could, let’s say through a touchscreen, offer different purchase options.
For example a $1 soda machine. You put in the dollar and push the cola button. The machine has the screen and, randomly, flashes two buttons… Continue with cola purchase or entertain different options.
You click different options and perhaps it asks:
“Would you like two root beers instead? One will not be cold because we’d ask if you to have it later, perhaps with a meal.”
Or maybe... “ we like to have more people try our orange soda. For an additional $.50 you can have two cans of orange soda.”