Not sure for this one , but in last similar event , you must be sure to buy and sell EXACTLY same amount , or bonus will not work (example , you cant buy 5000 and sell 4999 or other way around , it will cancel event bonus ) !
Glad most are enjoying this. As Alley mentioned, it was very simple to make this versus an official story event that has RP ramifications. I personally thought it would be fun to host a little event like this (With @"King Boo"'s help on how to host an event), since as it was pointed out, I recently got re-appointed. As Thy'zul pointed out, Admins are not always Devs, so things that are Dev related have a new layer to be voted on/discussed.
Either way, I wanted to have a little fun and make something enjoyable for the community. Sad that some don't see it that way, but glad the majority are enjoying themselves.
I found it interesting that there are such events so that we are not in monotony, although I am against smuggling, especially drug, even if it is synthetic. hehehe