Read the agreement - Cobb County is getting screwed.
https://docs.google.com/file/d/1qP6a...DHZwlepfY/edit

Basics.
Cobb County pays for half of the stadium, and the Braves will pay $3M in rent each year, but Cobb County has to pay half of maintenance and repair. The revenue from parking, games, etc, all go to the Braves and Cobb County can only have 3 events per year there themselves, and those cannot be concerts or sporting events. Any sporting event or concert revenue goes to the Braves.
Cobb pays out $300M minimum, and then gets $60M back in rent if the Braves stay 20 years (like they just did with Turner Field). That means that Cobb County can host 60 events over the next 20 years and each event needs to bring in an average of $4M per event just to break even. What kind of events besides concerts and sporting events will bring in that kind of money? County fairs?
Oh wait, that doesn't take into account the interest on the loans or the cost of maintenance on the stadium over the next 20 years. Wonder where they will get the money.... sounds like higher taxes will be likely.