Now run the numbers with a buddy in the car going with you. Airfare doubles, car costs remain virtually the same. For really dramatic savings, consider the case of 4 buddies (or a family of 4 or more) in a van that gets 25mpg.
Don't forget to factor in the rental car or taxi costs you'll have if you fly.
Of course, that's an exceptionally long drive and that is a subjective factor. If it's too much driving for someone then no amount of savings matters. If I were doing it I'd make a stop in Pensacola for the Oriskany and maybe another for Ginnie or other springs. Can't do that flying.
Doesn't a person's time spent in a car have a cost?
Hotels?
Food?