Originally Posted by
stifle
No, it's so people will purchase the substantially more expensive options available inside the venue.
Knowing a few event management people, I can safely say it is for both reasons. They and the police are concerned about dealing with over-served patrons. However they are even more concerned about making a big profit for their bosses and bonuses.
I know one stadium that has about 15 thousand seats that would earn a few hundred thousand on an average night in F&B sales. So for the Games, add up all the nights and all the stadiums and all the tickets sold and it should be nice windfall if managed correctly.