Because our fanbase is based off of convenience. If it isnt convenient to be at the game and things aren't in perfect condition, they wont go.
Sadly the school has separated itself from football culture for too long. Uga, Alabama, auburn, all push football down your throat, basically saying dont come here if you dont go to the game. We have stopped that. Plus they type of people tech attracts aren't necessarily the athletic type. Most are more interested in swimming, badminton, and other non contact sports.
We need to fuel the "frat" mentality back to tech. That football is king and they make the rules. Otherwise we will continue to see this happen. For probably 20 years tech has let the program slip. Just doing enough to keep it going or slightly above average. We have a long ways to go to get a base of a true 45k. I doubt we put 38k in for bowling green. Miami and Clemson will be packed, but due to 30-40% being of the other teams fan.
Plus it doesn't help tech fans move away from Atlanta. Usually more progressive in thoughts and escape the bible belt. At least the majority of the recent grads I know from the past 10 years.