Buy Store bug

i have really no idea how the hell he did it...

let's go to the beginning.
poor lowbie arcana lord is lurking in aden coz no1 wants to have him in party.
he sees a great opportunity for profit!
some1 is buying stolen infernium ore for 3kk and some1 else, sitting near, is selling it for 500k!
that silly arcana lord has been playing l2 for like 5 years and never seen a buy shop unable to pay for items...
well, what happened?
http://img62.imageshack.us/img62/9170/shot00018kn.png
http://img819.imageshack.us/img819/7109/shot00019cn.png
http://i43.tinypic.com/op1h1y.png
http://i40.tinypic.com/fuz5oh.png
eventually i sold my stolen infernium ore to another silly player for 500k.



edit: okay, i know now, how to make such scam store. you can delete this thread.