Fatparrot makes a good point. Another is those ads similar to a currnet one under dealer demos for tube amps. "Someone's lucky day, special price, $1.00". Then following the links takes you to a $19,900 retail amp for the bargain price of $14,995.
All this brings up the possibility that ad postings might be better segmented on the 'Gon. On the other hand, I appreciate that things should be as open as possible and that people and dealers should act within a certain, self-enforced decorum, without resorting to the use of a "heavy hand". Most individuals and dealers here are as honest as the day is long (though my days seem to be short!) and "rogues", as always, ruin it for the rest. Guess the best we can all do is be careful, do our homework, and ignore those ads we don't like or are too good to be true. A pity that some of these ads ARE a total waste of everyone's time or are but a lure to "get your attention" and sell you SOMETHING.