Thats exactly what I've been saying for a while now. If some guy comes on here and is new to the hobby and see's that someone is selling an AM radio for $300, then he might think thats the going rate for them. Once he pays for it then the next guy sees that and puts his radio up for $300. Before you know it, $250 is a helluva deal for a broke down AM radio.
There is a guy on my local craigs list selling 73 Duster doors for $600, the hood for $350, the trunk for $325 and the "Duster" emblems for $100 a piece. I emailed him and told him he's listing some of these things for 1000% over what they are actually worth and he basically told me to F*&% off. I just don't like seeing greedy people turn this hobby into something only upper middle class people can afford.