He would not sell these devices. He would be someone who feeds false information into them to screw with people that are on the other end, and laugh manically while doing so.
Maybe I have an overactive conscience, but I'd feel kind of wrong about selling without disclosing that I had good reason to believe it was compromised (a serious, unfixable, almost-invisible defect), and probably nobody would buy if I told them that.
Agreed. This would be similar to knowingly selling a defective device, only much worse.
But another thought that crosses my mind is that future disclosures and research may give him new insight to inspect the equipment and try to understand the extent of potential compromise. I would replace it but then hold onto it forever. Twenty years from now, the parts could be a goldmine for documenting what will surely be a historically significant time in the world of surveillance and privacy.
He would not sell these devices. He would be someone who feeds false information into them to screw with people that are on the other end, and laugh manically while doing so.