This is the risk that comes with using a site that relies so heavily on trust, it leaves us all open to misfortune and/or dishonesty. Fortunately I've had nothing but good experiences on here, although there have been times where I started to worry about whether or not that extremely expensive package was really on the way only for them to arrive late, but so far I've only had a single occasion where the item didn't arrive and the seller instantly offered a refund.
Every transaction on here is a bit of a gamble, it's not only lack of moral integrity that we have to fear, all manner of reasons could result in a deal going south, lost in the mail, injury or sickness interfering with the ability to send the item, dare I say it even death, so although it's easy to jump to what seems like the obvious conclusions, it may not always be as straight forward as that.
If Shaznaz is reading this thread, and I am sure he is, I hope he steps up and does the right thing, it may feel like you are safe and secure behind your internet anonymity and free from the legal and financial penalties that other sites wield, but karma always finds a way to even the score one way or another. That nagging feeling in the pit of your stomach that you know deep down is telling you to make things right isn't a figment of your imagination, it's your subconscious being raising the alarm about potential consequences for your actions, consequences that may be well deserved and that you are pretending don't exist.