What I've done in the past is just emailed each individual bidder about the issue I have with the guitar, especially if it was completely misrepresented intentionally. Then sometimes they withdraw their bids and leave a message that the guitar was misrepresented, and that pretty much jinxes the auction.
Also, if an item just has a mistake in it that I know should be corrected, I just email the seller and give them the info. and they usually update their auctions, being honest... BUT...
There was this guy a while back selling a guitar similar to one I had just sold and when I read the auction description, it started like...
"Hi, I am currently a teacher in Tokyo and have just found a really nice guitar I can offer you..." and I realized that it was MY description I was reading! :x
The jerk actually stole ALL of my text from my auction and used it for his auction! Then I wrote him about it, and he actually tried to tell me that there was no error in his listing, so I asked him where in Tokyo he was and what school he taught at and he never replied. I went out of my way to sabotage his auction by reporting him to eBay and warning all of his bidders then, because he was trying to be ME. :x I know I'm cool and everything, but come on now! Stealing someone's identity is pretty bad. :lol:
But I agree with all you guys, we really should warn folks if we see ahead o time that something they're selling is not entirely correct, or if they're bidding on something we KNOW is a scam attempt, we should warn them. I know you guys have helped me when I list something that has a mistake, and I really felt good when I bid on a Fender '59 neck a while back, went away for the weekend, and came back to be swamped with emails from people genuinely ehlping out, telling me that the guitar neck was a fake. I mean, I got like 30 emails! Makes you feel good to know others are watching out for you - APM