I would rather park at the airport or East Point then ride the train through downtown to get to the new venue than pay $25 to park, fight rush hour traffic and waste the gas. To be honest, I have no problem with the MARTA trains. I rode them to work for years and never had a negative experience worth remembering. I have never stepped foot on a MARTA bus and will not.
That could be the elephant in the room. Why make it too easy to avoid paying for parking?
I drive because I like being able to tailgate a little bit and I hope the new place has a better parking situation.