Morningstar!
I don't know if it's the same person ... some of the BDC'ers say it's someone who's username started with an R originally, been frozen a few times, blah blah blah. You know, the usual.
Anjuna, I really think some people get a sick thrill out of getting other people iced and cheesing TNT off. Plus they know there's only so much TNT can actually do to them.
Gabby, I hadn't heard anything about draik (or any other) TP, so if what you're bidding on is the right price I'd guess you should be ok. If you're really worried, if you win the auction put the potion on the trading post with a note to TNT to delete it if it's duped and report the auction - username auctioning it, lot number, date, what you paid for it and that it's on the post and give them that lot number. You should be contacted by someone.
If you get anything that you even think is duped Don't use it, discard it, sell it, give it to anyone or the money tree. Put it in trades with the note to TNT and send a report in.
What's cheap and what's too cheap? Hmmm, ok. Let's say you're looking for RoTL (one of the duped items). They generally seem to be selling for around 4.2 to 4.4 million. Now, you see one in auctions for 2 million. Or you find a krawk petpet buyable. That should be a big warning signal ... do not even think about bidding/buying.
Remember, if it looks to good to be true, it probably is. You all have NO idea what I'd do if this was my kid and I found out they were doing something like this