If anyone mentioned the advisory comment, I would emphasize the "slight" as opposed to the "corrosion". If it wasn't too bad I would jack it up myself (the easiest job in the world with a gen 7), take some pictures, and add those to the advert.
I do, however, agree that GTs are a little overpriced. Let's be honest - and I owned one for four years myself, so I will happily argue with anyone - they are just a T Sport in a party frock. [Although, if I ever buy another one, I reserve the right to change that opinion].