Destroying the value of all used stuff and risking people's lives
It's a shame that there are a few people out there that would rip off their grandma if they thought they could get away with it and that spoils it for all. On the other hand I have bought engines and planes over the net and it worked out great, I have picked up a few planes at swap meets that were very good deals and a couple that weren't but that was my fault for not inspecting the plane a little better. I don't think I would try to save money on used radio gear unless it was from someone I know, it's just not worth the savings to loose a thousand dollar airplane to save twenty bucks on a used receiver.