John,
I realize that buying used is somewhat of a gamble. I do my best on making sure that the seller is trustworthy, either by feedback or some of the thread responses. I have yet to run into a dishonest Audiogoner. I also realize that shipping is also a gamble, especially with tubes and carts. I also do a lot of selling on this site, which helps with my own upgrading, there is definitely more bang for the buck and until I hit the lotto, I will keep buying more used equipment. At least until I get burned.
I do appreciate your warning and hope that you do not get the opportunity to say" I told you so" and I'm sure that you are not hoping for that to happen.
Jeff