That is just silly.
Sports to go to in Columbia:
USCe football/basketball
The Columbia Fireflies (minor league 1-A baseball)
Sports to go to in Atlanta:
GT football/basketball
Braves
Falcons
Hawks
Atlanta United
Dream (WNBA)
Gwinnett Braves (minor league baseball)
Gladiators (minor league hockey)
Rhinos (minor league rugby)
Silverbacks (minor league soccer)
Also, Atlanta is a huge transplant city where most folks didn't grow up and came here with pre-existing sports allegiances. That is not the case with Columbia. Atlanta is also probably the biggest or second biggest alumni city for teams like UGA, Auburn, Clemson, Alabama, FSU, etc. That is also not the case with Columbia. Atlanta also has a huge host of higher-end concerts and entertainment options that probably don't exist in Columbia. The competition for non-alumni fans for entertainment dollars in Atlanta is simply in another stratosphere compared to USCe.
How many college teams in large metropolitan cities draw well? Not a ton of college teams in downtown NYC, Chicago, Philly, Washington, Boston, Detroit, etc. packing out 77k in college stadiums on a regular basis. A few, but not many. Look at the list of top 30 NCAA attendance. USCw, UCLA, and Miami may the the only 3 in big city markets, with all three drawing less than USCe. Miami averages almost 20k less, at around 58k.