It's not rocket science to set up an Escrow.com transaction to pump up a crappy extention. In fact, the practice is often put to use for "head-scratcher" sales (what's a few hundred or a few thousand when you can draw in suckers for more sales).
It's not important on whether you can prove it or not. There are lots of things that cannot be proven, but experienced people know are false.
It's not a coincidence that most, if not all of these questionable sales have Whois information that is impossible to verify (Private ,or people who don't exist).
Just go over the top 100 sales and write down a few that seem absurd. Then do a little research. You will avoid those people as well as the extention. Most of the sales originate from someone who has a vested interest in the extention or in similar names.
Let them embarass themselves. They aren't fooling anybody. Maybe one or two of the absurd prices are legit, but it doesn't really matter in the long run. If you were really sitting on the goods you would be quiet as a mouse.
Another common tactic is to take a crappy extention to a Sedo auction. Everyone knows Sedo won't go after fake bidders, so the person with the crap name sets up the first bid and waits for the suckers. Usually, about two weeks later someone asks him about his sale in one of his threads on a forum. The response generally goes something like this: "I regret to inform you that the sale of name.crapextention fell through. The buyer disappeared". Of course, many of these fake auctions have multiple bidders, so why not just sell it to the next in line? There is no next in line...if you catch my drift. The final comments go something like this: "I am pulling the name off the market", or "Back to the vault", followed by the cheerleaders of the extention saying: "Don't worry, you'll get more for it later". It's fun to watch.
Pump, Pump, Pump, Dump, Dump, Dump. New extention...Pump, Pump...Dump, Dump. That's the program to reel in new suckers.