He's selling his property. He's free to ask whatever he wants, and you are free to purchase or not. When he bought them and what he paid is also irrelevant. This specific forum is a marketplace, and nothing more.
I don't understand why so many members here want to treat this hobby as if it were an actual human being to which we all have a social duty to protect and preserve. Maybe we should change the classified's title to "Place to show everyone what a great and charitable person you are"...