just had an interesting conversation with my cousin who is in the armed response team that operates out of ilford police station in essex , and from what he told me ebay can trace the bogus bidders in secounds if they want as every email address leaves a unique signature that will always deposit the same ip address regardless of how many email addresses they use and this ip address will tell them the real culprits registered address, this even works if they use a wireless or wifi conection at a mcdonalds for example.
they think there safe as the email will be traced back to mcdonalds but this is not the case as if they have ever used the device from there actual ip address this is the one that is registered!
cant say anymore at the moment but will keep you updated!