I have a very different opinion than the others here. I think the bird is pretty in spite of it's appearance. He looks very unhappy, that could be fixed with a lot of TLC. I would not shy away from the bird because of a bacterial infection. Talon came to us with one at 9 weeks old, and we kept it in under control and it went completely away with the use of homeopathic methods, used under the direction and advice of our avian vet, and not the use of medications. It did take longer, as she had it for several months, but she looked as healthy as any other TAG here, her entire life.
I would pay $400 to take that bird away and rescue it from it's owners. With care, it will most likely become as healthy and sweet as possible. And in the event that something unthinkable happened, at least you have given that bird the best chance at life as possible.
I do agree the eyes look different, but it's still a sweet lovable bird.