It should be obvious to anyone with a grain of sense that on-line auction sites are a powerful magnet for the criminal fraternity. Large numbers of people, fueled by greed, think that they'll get something good for almost nothing, and there's no shortage of other people ready and waiting for them.
Ebay's reaction to the statement that fraudulent transactions have increased of late was this:
"The vast majority of the cases relate to transactions that did not take place on eBay. We have been led to believe that, in most of the cases, the users were contacted via email – rather than on the eBay site. Payments were made using money transfer services such as Western Union, which are banned on eBay because they are not traceable."
None of which surprises me. What happens is that people are blinded to reality by their own greed. Driven by the urge to get that perfect 'bargain' they plough on, apparently oblivious to all the warning signs and then, when it all goes horribly wrong they blame Ebay for not protecting them, when all along they might have protected themselves by using a little basic commonsense.