Any other people getting hacked?

Social engineering.

I knew it must've been that. There was really no other possible reason. Nexon's security obviously isn't so weak that someone, even the most experienced hacker, can access their databases or anything like that. I'm almost sure of that. In fact, I never even thought it might have been their fault. It's just that hackers are always finding more and more complex ways of finding out useful informations to be able to get their hands on your accounts.

.. I've never been hacked, but.. I'll lock my items just to make sure.

That method would be way too slow to explain the major account hack epidemic a year ago.
Besides, not everyone uses msn, or facebook, has static ip, uses main email for ms email, which this method would seem to require (unless I misunderstood something)
Plus, they still need the maplestory user id. Unless you are silly enough to post that on facebook or something, or never delete your 'Welcome to Maplestory, you id, pw is' email from Nexon, how do they get that?

Edit:
Just remembered: When you charge NX, you get a 'Purchase Confirmation' email, which also has your ID in it. Best to delete those immediately.
That may explain why some people get hacked immediately after charging NX. The hacker already had their email and was just waiting to find out their ID.