I have always purchased non operating trains and fixed them for re sale. I also stand behind them. For guys who do that (not shops) we are all hearing "what is the bottom price" People do not want to pay a fair price from someone reliable but will roll the dice and get screwed big time on fleabay. Everyone wants to be a wheeler/dealer and get the lowest price. I blame the TV show American Pickers. Everyone thinks they are Mike or Frank and want to beat you up on your price. I smiled when they got screwed on a junk state set. Their expert told them only a few of those sets exist. Experts exist in Iowa and I do not know where they got that guy.
I have always considered the OGR Forum the best place to deal on used trains.