I haven't seen fairy wings sell for under 650-700k in a very long time. The might have sold for under that the first day or two that they were released, until they skyrocketed in value when everyone wanted them.
As for fire dragon wings...I think it depends on the seller. I'm not sure if these were made tradable yet, but others valued the wings from 50-250k before we noticed you couldn't trade them. It was a very difficult quest, but they are more common than fairy wings.