There is no way that someone willing to spend that much on an item didn't know it wasn't obtained legitimately.
I'm willing to bet that quite a few of the items were sold for real money too.
I think that permanently banning these accounts is justified. Letting people go will just set a bad precedent:
"I can hack and get the items on a mule, sell the items to myself, and not get banned on my main. Or I can just ask someone that hacks to get the items for me and I'll still be okay."
At the very least these accounts should be removed from rankings, and banned for a few weeks.
Brief bug summary: The Maple 3x MMO Champion Medal that was given to celebrate the 3 awards is not registering in the medal collection. http://i.imgur.com/giv1tpb.jpg
Character name: Thanks Character level: 180 Character job: Night Lord World name: Scania
and 8 others. 
