I hope you do find a decent ticket. I would encourage you to keep checking regularly (I know it's a pain.): I have grabbed fantastic seats for many shows (Springsteen, Pearl Jam...) in the days leading up to a show.
And I would also add that GA does allow you the choice of hanging back a bit so you are not in the throng (I'm guessing you could stand by the sound board and have enough room to swing your arms around.) Having said that, my +1 will have nothing to do with GA (esp in a stadium) so I certainly understand why one might not be convinced!