It's not some sort of l33t hack. Sigex is nothing more than a scammer. Tricking you into giving him your account details is just a form of scamming. If he was hacking you, he would have some sort of password generator, or some brute force method perhaps of accessing your MSN account. Either way, he wouldn't need you to complete some sort of survey.
And, if he is able to get a hold of any other of your accounts, it's not because he is super smart, it's because you were dumb enough to use the same password and same recovery details for everything.
I guess it's better some of you learn now, then later down the road when some company offers you two free Sony PS3s, or a Nigerian prince offers billions of dollars across shore.