In your analogy, the person was ordering the "fries with as much ketchup as you need", which McDonalds was specifically advertising for people who need a lot of ketchup. Also we would live in a world where eating a few hundred ketchup packets wouldn't be very unusual.
Go to the Internet Archive and look at the Workspace pricing page of two years ago. They put it front and center that you would get "as much storage as you need". They also made you go through sales, so if they only intended to sell the product to people buying hundreds of seats, that would have been totally possible. They didn't.