I've been buying like this for two years and never had any problems. Both with keys and with sellers. Only through another source.
I don't understand why you're so light on people like that. Or you delete posts like Drunk Teacher, who did the same thing as Norot44.
I can understand that the key doesn't work or something, but then you have to give the money back. It doesn't give it back means he's a thief and nothing else. And you have to call things by their names. Scamer=The thief