This car isn't 'rusty', it's just not as perfect as we think a 23k mile should be -- it is truly a survivor type sitcheeashun.
And the torn vinyl at the back window is shrunk and torn, it's not burst from rust.
I don't want to defend Gateway, however I think classic car brokers don't have the detailed eyes that we do, because many of their buyers don't have them either. Some of the darkness on the lower quarters could be the result of the dark-colored floor + the excessive lighting to highlight the upper portion of the car. They did show us the torn vinyl top areas, and that could've been easily ignored if they wanted to.