So the author was fine taking part in a crime.
"No Mr. Judge, I did not know that large diamond could not cost $10."
However all he does is attempt to confirm is that he won't be the party to lose money in this scam. He does it thinking well either he will get shop.com and win (at the cost of the owners of shop.com), or it will be a scam and he will get his money back from Paypal and Paypal may or may not get the money back from the seller, in which case either Paypal loses money or everything is back where it began.
He try's to find a no-lose position in someone else's scam, basically trying to scam a scammer. You know what I could respect that, but whining about how you failed to scam the scammer is just annoying.
The rest of us call the people who run websites like that domain squatters, because they are adding zero value to the internet and simply tie up a domain which they would likely sell for the 'right' offer.