That doesn't outweigh the considerable risk of failure. Ask the NHL about Atlanta. The TV execs show Seattle & Portland every chance they get because they get to show full stadiums. TV markets ought to be secondary to the consideration of a passionate fanbase. Get the fans to create an atmosphere worth beaming into people's living rooms first.
Atlanta has proven in every single sport that it will not do that. Atlanta is the 9th best TV market and big enough to host the Olympics?
MLB: Braves: 13th in overall attendance, 21st in percentage out of 30 with 63.3%.
NHL: Thrashers in last year before they moved to Winnipeg (!): 28th out of 30, drawing around 13400
NBA: Hawks, this season, probably will make the playoffs: 28 out of 30 average attendance drawing 83.6% which is 27th best, only beating out the Bucks (worst team in league) 76ers (a close second) and the Pistons (a disaster of a team in a dying city).
NFL: Falcons, in 2012 when they earned the #1 seed in the NFC: 11th best total in NFL, with a 95.5% drawing, good for...18th best in a league of 32.
The Thrashers were terrible, but those weren't bad teams. The Braves have been one of the best teams in baseball the last two decades. The Hawks have made the playoffs more often than not. The Falcons earned the #1 seed. What other numbers do you need to look at? Atlanta doesn't care about its sports teams. It's not a sports town. Putting a franchise there is a waste, especially there are plenty of other venues out there.