Of course not. It lets their office or even corporate computers change the prices in real time whenever they feel like it. Hypothetically, you could pick something off a shelf where the digital signset $3, and by the time you walked it up to a register, it cost $4. It's like changing the price of something in a shop simulation video game after the customer has picked it up, and now they have to pay $9,999.99 for a bag of potato chips.